I have this issue big time. Vomiting used to be part of a birthday party routine for me and I had a job where i had diarrhea M- F from 8 am until noon.

My saving grace is ranitidine. It's an over the counter reflux medication. I tried chewable Tums, but that just gave the vomit a fruity flavor, which although it was an improvement, it still wasn't fun. Anyway, the doc recommended ranitidine and i have tried others that didn't help, this usually stops it.

I also drink tea and avoid fast food, greasy foods, and excessively salty foods, as they will also cause the vomiting/diarrhea. For me dairy helps and if you do vomit anyway, it cuts back on the burn a bit. Sometimes plan carbs- like a little bread with nothing on it- will help in situations such as yours.

I hope it works out for you, I know all too well how much it sucks.