Hi. Thanks for your query. Noted the history and understood your concerns. Since there are eggy farts and bad burps along with explosive diarrhea, weight loss, have no appetite, nausea and lower abdominal rumbling, these are classical of an intestinal infection irrespective of negative stool tests. I would advise you hte following in such a situation: Get a course of an antibiotic, metronidazole and probiotics. Plenty of oral fluids and electrolyte solution as dehydration and malabsorption might have caused you weight loss. PPI like Omeprazole and Domperidone for nausea. Activated charcoal tablets, curds, banana also helps a lot. If required fo for further tests of CT scan of abdomen, colonoscopy and blood tests for liver functions, thyroid function and others. Get treated for any medical ailments identified so far.