I feel for you also being a musician but I think you should consult with a real doctor if you think it's really serious. I have a problem with my throat as I can't sing much with out my throat being irritated. I 've had this problem for years and seems to be getting worse where I feel like I'm coming down w a cold but it never happens. My reg. doc thinks it may be from long term reflux and I think I'll go to the ENT and get it worked up more. How did your preformance go?
It could be allergies. While my throat never closed up, swelling in the throat is sometimes a symptom of an allergic reaction. Mine was nuts, but it could be seafood or something. I'd take it to a doctor, especially because you couldn't breathe - that's a major problem of something being wrong. If s/he thinks it's an allergy, then s/he should refer you to an allergist for testing. If it is an allergy, then you need an Epi pen or meds.
Even if it isn't allergies, go see a doctor. Not being able to breathe is serious.
i cant go to a doctor, im lacking health insurence, but now its like whenever im stressed it happens.. and the performance sucked btw, i couldnt even get 1/2 of the notes out.
so, i found out it was strep, weird huh? i wasnt aware that strep could do that