Vegetarians and vegans: Do you have any remedies for accidental meat consumption?

My boyfriend and I went to a restaurant tonight just a few hours ago. I ordered a veggie burger and he ordered a hamburger. I ate the veggie burger it was delicious and then felt kinda funny in the stomach area. At first, I thought it was just because I ate it very fast. However, this was an hour ago and now I’m still feeling kinda funny and I had a lovely little diarrhea issue in the restaurant bathroom. I suspect that the cook may have accidentally cooked my burger in the same oil that he cooked my boyfriend’s hamburger in.

So, I’m just wondering, are there any remedies to settle a tummy that is unused to meat once some meat has been accidentally ingested?