The one who diagnosed me was a holistic doctor. (A functional neurologist to be specific.) But yes, you're right. Not a lot of doctors know. Allergist can help as well but my appointment is later with them. A well rounded team of fields should be there for you in your journey. Best of luck to you.

I was diagnosed by an allergist/immunologist (told me to take anithistamines) but currently seeing a functional med doc (who wants to find + heal the root cause and get me off of antihistamines).

Yes a good functional doc is key. Gotta run all the tests. Also-a functional doc, Dr. Beth O’Hara has a really great site online called Mast Cell 360-tons of information about healing MCAS. That is her speciality.