Have you experienced this? Allergies?

Recently I can't keep any food down or anything besides water. When I do get something that will stay it's small (crackers, a noodle soup, something dry) and my throat feels like it's closing up for hours afterwards. I have the same closing of the throat feeling when I come in contact with latex (I have a latex allergy). I can't figure out what's going on. I plan on going to the doctor but I wanted to see if anyone else had a similar experience or knows what it is.