WGB you seem like one of the smarter people on this forum i hope you stick around and let us know when you find out which food caused this adverse reaction.
my guess is the garlic or onion caused the reaction, these 2 foods are questionable because they cause quite a bit of irritation to the lining of the intestines while being digested.
I know that I have a messed up digestive system, maybe eating spicy foods, garlic and onions keeps irritating the area that is trying to heal and keeps the cycle going?
please do some testing, it should only take a day!