Working with gastroenterologist to determine what causes 1) noxious, gassy, prolonged burping and flatulence, followed within 2-3 hours by 2) explosive diarrhea with 10-15 episodes over next 12 hours until my system is purged. Then I feel fine until next occurrence. 1-2 weeks may go by between these bouts. No pain and no bleeding. Monitoring fodmap diet, BMs and sleep patterns. Suggestions please?