'temperature goes through the roof, and I get physical stomach cramps - no, not an ouchy ache, actual uncontolled muscle knots like you get in your leg *but in my stomach*' counts as an intolerance or an allergy, since I don't get a rash/difficulty breathing, etc - but I'm disinclined to continue exposing my immune system in case I find out the empirical way!

Oh, goodness, yes, I know that one! Mostly I figure it is a moot point whether it's an allergen or intolerance, since a)it's unpleasant enough regardless of what's causing it and b)anti-allergy treatments don't work (on me anyway) on stomach symptoms, even for known allergens.

Does your doc recommend interleaving doses of buscopan and mebeverine too for really severe bouts? Utter magic! (But presumably only something to be done on the instructions of a doc!)