Most perimenopausal histamine/MCAS patients arrive un-named. This is the reference that names the pattern fast, orders the workup correctly, and sequences the protocol so the same interventions actually work — instead of failing because they ran in the wrong order. Written peer-to-peer, at clinical altitude. Not a patient handout. Inside: The mast cell activation spectrum and why it presents like a personality, not a disease A representative case (de-identified composite) showing how 4-5 drivers stack in one patient The five drivers with clinical-level detail: stealth infection, nervous system, estrogen (amplifier AND withdrawal), nutrient depletion, mold/mycotoxins A targeted lab panel with clinical interpretation: DAO/histamine, AOC1/HNMT/MTHFR/COMT, stool, DUTCH, vitamin D/ferritin, CIRS + ERMI/VCS The sequencing logic that determines success or failure: foundations first, drainage before mobilization, one variable at a time, limbic-first in the hyper-reactive, mold-remediate-first The full protocol with clinical rationale for every category Refer/co-manage criteria and hard stops (active hormone-sensitive cancer, ongoing mold exposure, red flags) Key references, verified Who it's for: functional medicine practitioners, nurse practitioners, and clinicians who see perimenopausal patients with multi-system reactivity and want the mechanism, the workup, and the sequencing — not a symptom checklist. By Brie Wieselman, L.Ac., FMP. Licensed primary care provider, 27 years in functional and Chinese medicine. Decision-support reference, not a standing order. Individualize to your patient's labs and history.