Hi and welcome to HCM.
Well, Crohns disease
should be confirmed by biopsy
. It souldnt be just "may be crohn". This is inflammatory disease which has good and bad phases and it is always hard to predict dynamics of it.
SOmwtime it isnt related to dietary but some food can trigger worseining such as :alcohol, butter, margarine, oils, carbonated beverages, coffee,chocolate,fatty foods (fried foods), foods high in fiber,gas-producing foods (lentils, beans, legumes, cabbage, broccoli, onions). so try to avoid these.
Also these are contrast radilogical methods which can confirm diagnosis and then some medicines may be prescribed. WIsh you good health.