Talk to Gastroenterologist on Gastroenterologist (Gluten Disorder)

A few months back I has severe diarrhea and it lasted for quite a long time, 1 month or more. Then I became good (I started eating wheat, but red flour or chakki ka aata instead of white flour or safaid aata). It went well and for a few times till now I have seen that whenever I eat pizza/ shwarma/ fast food those severe abdominal cramps and diarrhea come again. Is this a wheat allergy or should I test for lactose intolerance? I don't know what is this