Hey I had this too, for a few days though.. I also tried to cough it out, but it didn't work TToTT
It was like something was pushing against the breating part, making it harder to breathe...
Then I ate fish.. and it started to hurt while swallowing after I ate dinner, so I tried singing it out (desperately trying every method LOL)
So I tried that, but it felt like it didn't work, also I couldn't sing good, I was off many times because of this, but I just screamed and shouted it all out.
The next day I woke up and it was gone!
Don't know if my problem was a panick thing like yours though..
I'm not a docter either, but maybe you could try screaming it out xD
No.. sounds crazy, don't listen to me o.o'