Gagging from nervousness, nasal drip

Dear Doctor,
For the past 8 years I've had nose problems that would affect my throat. Whenever I'm nervous (which is very often, even little things like going to karaoke or meeting friends) I gag and cough up either mucus or nothing. I feel irritation on my upper throat, and I think it all stems from my nose, because when I'm nervous I feel that something from my sinuses is opening or allowing flow of whatever is in the nose to drip onto my throat. This makes me nervous and when I'm nervous I gag (and sometimes even vomit from the gagging) because of this, so it's a vicious cycle. I've gone to the doctors but they don't seem to know what's wrong. I've had xrays for my stomach to see if it was acid reflux, but I don't think they found anything. however, on a separate xray they did find that i had a serious nose infection, however my insurance expired by then and i wasn't able to follow up. I've taken acid reflux medicine and they haven't worked. Neither have some anti-depressants when I went to the psychiatrist. I do think it's somewhat psychological, but that the main reason is something physical, which is why the anti-depressants didn't help my anxiety and therefore didn't help cure my symptoms. i've went to multiple doctors (~10 doctors) and none of them have given me anything that works, just dumb antibiotics. because of school, lack of money, and no insurance i have not been able to find any answer, but i read a similar post to mine and feel that you have more knowledge.

Here's a list of when my gagging comes up. usually i just cough up mucus or nothing at all:
-when i have a stuffy nose. like during the winter. usually something like a hot shower where i can blow everything out makes me feel better.
-in the mornings. i feel like maybe i have some sort of mental hormone problem in the morning... i am nervous in the mornings and can barely consume food. mornings are the worst.
-when i eat sweet stuff (chocolate, anything with sugar), or stuff that is sticky
-when i eat anything. it gets progressively better as the day goes by. so in the morning i can't function, but at night i have an appetite
-when i eat too full. i feel like my stomach sticks out abnormally when i eat until i'm full.
-whenever i exercise. the first hour will be really bad, but towards the end it eases.
-whenever i lay down on my bed and talk or just lay down on my bed without the purpose of sleeping.
-****when i'm nervous. this is a big one. i can't do public speaking or interviews because i gag so bad beforehand. however most of the time when the moment comes to actually have to speak, my mind eases, but i have gagged during the big moment before.

please let me know if there's any diagnosis. i'm suffering really bad and it's affecting my job search because i avoid anything that requires presentations.