My husband has been experiencing what we re calling a greasy belly. Indigestion, burping, foul tasting and smelling. It starts with this then generally runs into nasty diarrhea. He is diabetic and currently takes Amaryl. Could it be his gallbladder? This has been going on now for a long time. It is hit or miss. We ve tried to narrow it down to triggers..... foods, etc. and can not seem to pinpoint anything specific? suggestions please...