[MRM]

Sounds a lot like a food borne illness. I've had it twice in the last 10 years. I would feel fine unless I ate, then I would feel just like you describe. Pepto has a small antibiotic effect, so it would actually make me feel better, but wasn't enought to kill the bug. Both times I had to go to the doc and got standard antibiotics. Within 24 hours I was fine and overeating as usual. But without the meds I would have suffered forever. Go in sooner rather than later. You'll feel better.