Hi...I am 6 weeks post op and twice in the last week I have been awoken in the middle of the night feeling like I am going to vomit. Lots of retching, coughing and it feels awful. Then for a couple of days my stomach and intestines are grumbling, and I ha pave the worst rancid taste. Any ideas on why this would be happening? It really caught me off guard because others wise all has been going really well.