Gastritis w/diarrhea for 3 months i've been to a gastroenterologist several times, had a colonoscopy, edg, barium mri found nothing but sill having d?

Chronic Diarrhea: Chronic diarrhea can be due to a lot of things. Stool studies are done to rule out infectious etiogies. Make sure you get tested for thyroid disorder/lactose intolerance/celiac disease/chronic pancreatitis. If all workups are negative, chronic diarrhea might be from ibs (irritable bowel disease) specially if its associated with abdominal pain.