2 years back I had sudden black tarry stools after eating non veg from outside. Dr. prescribed antacids and niacin which didn't work and after 2 month I visited Dr. for endoscopy which resulted nothing but my symptoms were remained same. Now after almost 2 years back again I had same black terry motion and have same symptoms as I have ulcer. What to do please advise? My major symptoms are feeling hungry after couple of hours, indigestion, nausea sometimes, passing excessive amount of smelly wind with distinct odor specially after eating, weight loss, lazy most of the time.