What Doctors Don’t Tell You About Perimenopause — Probably Because They Don’t Know. The Hidden Impact of ACEs on Your Hormone Journey

One of my greatest gifts is my curiosity. And my relentless “why.” If something feels off, it usually is. And that’s exactly how I feel about the current perimenopause narrative.

Here’s what I keep seeing. Women in their forties — smart, capable, successful women — suddenly feeling like they are falling apart. They can’t sleep. They wake between 2am and 4am and cannot get back to sleep. They’re irritable, emotional, wired but exhausted. Their stress tolerance has evaporated. They don’t feel like themselves anymore.

They go to their GP and leave with HRT, antidepressants, sometimes both.

Every. Single. Time.

But what if hormones are only part of the story? What if the intensity of your perimenopause experience has less to do with estrogen alone and more to do with your nervous system history?

Let me introduce a missing piece: ACEs.

In the 1990s, the landmark Adverse Childhood Experiences Study conducted by the Centers for Disease Control and Prevention and Kaiser Permanente found something revolutionary. Early life stress — abuse, neglect, household dysfunction — doesn’t just shape your psychology. It shapes your biology. High ACE scores were linked to increased risk of heart disease, autoimmune disorders, depression, metabolic dysfunction and chronic inflammation. Early stress calibrates your nervous system for life. It programs the HPA axis, alters cortisol patterns and shifts inflammatory responses.

Perimenopause is one of the biggest stress tests your system will ever go through.

Perimenopause is not simply about estrogen dropping. It is about fluctuation. Ovulation becomes inconsistent, which means progesterone — only produced after ovulation — is often the first hormone to decline. Estrogen then begins to swing unpredictably. Not just down, but up and down. And those swings are what many women feel.

Estrogen does far more than regulate your cycle. It enhances serotonin and dopamine activity, supports GABA (your calming neurotransmitter), improves synaptic plasticity and helps regulate the stress response. It also modulates activity in the amygdala — the brain’s threat detection centre. When estrogen is stable, the prefrontal cortex has stronger regulatory control over the amygdala. When estrogen fluctuates, that buffering effect weakens. The amygdala becomes more reactive. The stress response activates more easily. Old emotional imprints can feel closer to the surface.

Not because you are regressing. Because the buffering system has changed.

Progesterone plays a different but equally important role. It converts in the brain to allopregnanolone, which enhances GABA receptor activity. GABA quiets neural firing and promotes calm. When ovulation becomes irregular and progesterone declines, that calming influence reduces. Less progesterone means less GABA support and greater nervous system excitability.

Layer that onto a nervous system that may already have been shaped by early adversity and suddenly you are wide awake at 3am. Cortisol naturally rises between 2am and 4am as part of a normal circadian rhythm. But if progesterone is low and your stress system is primed, that normal rise feels like a threat. Your mind races. You replay conversations with your boss. You catastrophise parents’ evening. You rehearse arguments that haven’t even happened. Your brain scans for danger. Not because you are dramatic, but because your inhibitory buffering has shifted.

If you experienced early adversity, your HPA axis may already be more reactive. Cortisol itself isn’t the villain; it keeps you alive. But chronically dysregulated cortisol can show up as early waking, anxiety spikes, blood sugar instability, increased abdominal fat and that wired-but-tired exhaustion so many women describe. Estrogen normally helps regulate this stress response. When estrogen fluctuates, cortisol patterns can become more erratic. If your nervous system was calibrated for hypervigilance in childhood, perimenopause can feel like someone has turned up the volume.

Oxytocin also deserves attention. Often called the bonding or safety hormone, it dampens amygdala activation and buffers stress. Estrogen supports oxytocin signalling. As estrogen fluctuates, some women feel more disconnected, less socially buffered, more sensitive in relationships. If early life lacked consistent emotional safety, that system may already be sensitised. Perimenopause can amplify relational strain in ways that feel confusing and deeply personal.

You may be thinking, “But I’ve done the therapy. I’ve healed. Why is this coming back?” Because trauma is not just the event; it is what happens in the nervous system. As Gabor Maté explains, trauma is about what occurs internally, not simply what happened externally. Two people can live through similar experiences; one develops a dysregulated stress response, one does not. It depends on perceived safety and the nervous system’s capacity to process the experience.

Healing matters. But healing does not erase biological imprinting. If you had your appendix removed at fifteen, the wound healed, but the scar remained. Your nervous system has scars too. Perimenopause does not create dysfunction; it reveals what has been buffered for decades by hormonal support.

And this is where the narrative becomes too shallow. If we reduce this entire transition to “your estrogen is low, here’s a patch,” we miss the bigger picture. Some women sail through perimenopause. Others feel like they are psychologically unravelling. Hormones are universal. Nervous system history is not.

Perimenopause may be less about deficiency and more about exposure.

It is a systems recalibration involving ovarian hormones, adrenal hormones, metabolic shifts, thyroid signalling, neurotransmitters and immune pathways — all in constant conversation with the nervous system. If you had a stable, well-buffered stress response growing up, this transition may feel manageable. If your early years required hypervigilance, adaptation, emotional suppression or self-reliance, perimenopause can feel like the scaffolding has been removed.

So what do you actually do about this?

I am not here to sell you anything. The wellness industry is awash with everything from therapists offering massage to “containers” that cost hundreds of pounds. Often creating dependancy rather than empowerment. This is not about another supplement or protocol. If perimenopause is exposing nervous system vulnerability, then the work is not only hormonal; it is regulatory.

Therapies such as EMDR (Eye Movement Desensitisation and Reprocessing) have strong clinical evidence for trauma treatment. EMDR helps the brain reprocess distressing memories so they are stored as past experiences rather than present threats. Neuroimaging research shows it can reduce amygdala hyperactivation and strengthen integration with the prefrontal cortex, facilitating memory reconsolidation and reducing emotional intensity. In simple terms, it helps the nervous system update old survival coding. IEMT works on similar principles, using eye movements to reduce emotional charge and shift identity-level imprints.

Somatic approaches and trauma-informed yoga are also increasingly studied for their impact on autonomic regulation. While there is no evidence that trauma is literally stored in muscle tissue, there is substantial evidence that trauma alters nervous system patterning. The brain and body are not separate entities; they operate as one integrated system. Your autonomic nervous system connects brain, heart, gut, fascia and immune signalling in continuous feedback loops. If your early life involved chronic tension or bracing, those patterns can become embodied habits. Practices that improve vagal tone, increase interoceptive awareness and support parasympathetic recovery can reduce baseline stress reactivity and improve emotional regulation, particularly during times of hormonal fluctuation.

What if perimenopause is not something to “get through,” but an invitation to a new level of safety? For decades you may have performed, overridden, adapted, achieved and survived. Perimenopause may be the first time your biology refuses to compensate.

This phase of life is not just hormonal. It is neurological, metabolic, relational and historical. And most of all, it is individual.

If something feels off, it probably is. Not because you are broken, but because your system is carrying decades of adaptive wiring. Perimenopause doesn’t create dysfunction. It reveals it.

https://pmc.ncbi.nlm.nih.gov/articles/PMC10527101/#:~:text=The%20current%20cross%2Dsectional%20data,than%20premenopausal%20and%20postmenopausal%20women.

https://www.nia.nih.gov/health/menopause/sleep-problems-and-menopause-what-can-i-do

https://www.christinajaniga.com/ptsd-perimenopause-menopause-trauma-therapy/

https://ftm.aamft.org/perimenopause-and-early-trauma-a-systemic-approach-for-mfts/?amp=1