I had gastroenteritis 2 days ago and i ate pizza last night now my stomach hurts and i have cramps what should i do ?

Avoid fat: Fatty foods (like pizza) can make symptoms of gastroenteritis worse. However there is no specific harm - just more discomfort for you. The usual management for gastroenteritis is drinking plenty of fluids. If you are becoming dizzy, unable to hold fluids, having bloody diarrhea, or are having increasingly frequent diarrhea episodes you should seek further care.