OMG! **hugs** That sounds terrible!! I hope it was just a one time thing. It's not often that I meet a fellow IBS person though!! At least if you and I go somewhere together and one of us "needs a bathroom NOW!", we'll totally be able to relate! LOL
Being sick and throwing up is the worse feeling in the world. I hope you're feeling better now!! Get yourself some goldfish crackers and chicken noodle soup!

As for the car, you may have to take it to get professionally steam cleaned if all else fails. Have you tried an enzymatic cleaner (like you would use for kitty throw-up)? I use Stain-Away, and it smells fabulous...like cinnamon!
I hope you're feeling better!
**hugs**