I have tried to find an allergist who can officially diagnosis MCAS for me but they are few and far between. I developed multiple food allergies following covid along with sporadic shortness of breath, tremendous itchy rashes on my legs, hot red cheeks after eating or drinking specific foods, fatigue, fluctuating pulse/blood pressure, nasal congestion, palpitations, and diarrhea. All of the food allergies are new post covid and my reactions initially were pretty severe. After 1 year on LDN, I have less reactions but when I do, they are significant. I do take Montelukast and a daily antihistamine but have yet to try cromolyn sodium. I do not take a histamine-2 blocker as I do not want to turn off most of the acid production in my stomach.