Unbearably tense and jittery--is this a peri thing?

I’m 44. My periods are getting increasingly erratic, although they’ve been like clockwork my whole life. Sometimes it’s a 20-day cycle. Sometimes it’s 40. Sometimes it’s super heavy. Sometimes it’s very light. My mom, grandma, and aunt were all done with bleeding at age 41, but my doctors say I’m too young for perimenopause.

I can’t sleep. Night sweats (no hot flashes as of now). Acne. Internal vibrations. Crazy fatigue. Aching teeth even though my dentist says I’m fine. Wild mood swings. I cry at everything. Brain fog–forgetting words constantly. And the worst part is this incessant feeling of inner tension that I guess is anxiety, maybe, but I’ve never had anxiety before, so I don’t know. It feels like my entire body is tight and wired, so I want to blow up and scream and cry and panic to release the intense pressure, but there’s zero reason for the feeling. This pressure builds and builds and has no outlet, no matter how I exercise to try and somehow vent the tension. It’s totally overwhelming and debilitating.

I’ve had CT scans, MRIs, blood work for thyroid and iron and everything else you could think. Everything is supposedly normal. Doctors tell me it’s all in my head. I have zero history of mental health problems. Never had depression or anxiety or panic or anything.

Does anyone else feel that horribly tense, jittery feeling in perimenopause? Is that what’s happening to me? I feel so alone and scared.