My husband is 52 years old and has been sick for 13 days. Symptoms have been nausea, vomiting, diarrhea, burping, bloated/full stomach, he has been hospitalized for 5 days. They cant figure it out. Has had endoscopy and colonoscopy, also stool cultures are negative for food poisoning or c-diff. Bloodwork is fine, gall bladder is fine. any ideas?