Hi. Thanks for your query. Noted the history of nausea, dry heaves, diarrhea, rumbling of intestines on eating or drinking something, Imodium and Dicyclomin did not helps, colonoscopy was normal. Gall bladder was removed in past hence do not tolerate food with high fat contents. Your history is not suggestive of stomach flu as there are other symptoms that do not fit into flu sort of thing. I think, this can be due to intestinal bacterial infection that is not setting and hence the complications. I would advise you the following: Get the stool and blood checked and if there is evidence of an infection only antibiotic, metronidazole can help you to get well. Also needed is probiotics, activated charcoal tablets, banana and curds in diet. Also maintain good hydration and electrolyte balance.