Well, anxiety does cause difficulty swallowing but what you describe seems a little extreme to me. To clarify, though, you're not really throwing up? I mean the food is stuck in your throat...it never got to your stomach? Sometimes that happens when I take my pills but that's the only thing I have to compare it to and of course it's not exactly the same thing. Or if it is the effect of it isn't as bad as what you're having.
I don't know. Do you think a lot about this before you eat? If you're preoccupied with it maybe that makes it more likely to happen? Not sure. I would think this would warrant a visit with a doctor, but I know what having no insurance is like so it's hard for me to say "go to the doctor".
Hopefully someone here has been through something similar.