I'm hoping someone on this for
um knows a lot more than I do about this subject! for
question number one, I would talk to a qualified allergist. Your pharmacist may have some answers as well.
Question number 2 is still out of the scope of my "practice," but if a person who suffers from anaphylaxis is on a benzo, IMHO, the use of that med will NOT decrease the likelyhood of an anyaphylatic response.