It could be an allergic reaction to something in the food. Instead of stomach medications, try an antihistamine and see if that helps. If it is an allergic reaction, the antihistamine will get rid of the histamine in your system and help reduce the swelling. I don't personally like benadryl, but it's usually what doctor's recommend. I think any antihistamine will work.

Swelling in the throat is a very legitmate thing to be anxious about. If it gets any worse, call the on call doctor or nurse to find out what to do. Hopefully, your breathing will improve and the swelling will go down once you take the antihistamine. I hope you feel better soon.