I have had intense (at times) belching over last 3-4 years. Stopped c-pap, no change; one doc wanted to take out gall bladder but others said not problem; tried to determine if certain foods or medicines might be cause--no change. I now think it is due to SIBO even tho I didn't test positive for it.. makes sense that it would be SIBO since I have had small intestine resection with removal of ileocecal valve. I know how miserable this can be. Wish you the best!