Rae, have you seen the pre-surgery recommendations on the Mastocytosis Society’s website? They have a list of medicines which are known mast cell degranulators to avoid and a protocol to follow pre-op to help prepare for surgery. You can print that out and discuss it at your pre-op appointment!
Have you looked into histamine foods aggravating your rashes? Histamine seems to have a “barrel effect” so you need to look at individual foods AND the total amounts of histamines. Google: Chronic Urticaria, Histamine Intolerance, DAO (diaminase oxide) for relevant info.
PLUS! Be sure you watch Dr. Diana’s video on Histamine! Right here! Oh… and be sure you ask for a low histamine diet in the hospital! Best of luck to you with your surgery.
Take care, SweetFeather