Hi Lex,
I'll try and offer what advice I can.
I had this friend who from anxiety and nerves had a year where he would burp uncontrollably. It would all start when he got nervous about something. So it's a physical, real thing, but it was totally regulated by intense emotions.
Before any of this LPR nonsense started for me, when I got nervous, like when I had an impending deadline, I'd just start these gagging fits, but never regurgitating or vomiting. But as you know, rockstars and such often vomit before a performance.
So indeed, our emotions and anxiety do actually cause a big part of our physical problems, as you know.
I think with the gagging, judging from my own life, that is anxiety. The regurgitating though seems a little severe. Your mind must really be in control of your body, because I think even typical severe GERD patients don't have something like that. That's almost like an emotional response, or like a tourette's patient having to suddenly spit uncontrollably.
You might want to try some sort of relaxation drugs. As for the mucus though, now we are drifting into the Alice in Wonderland world of LPR symptoms. I think maybe do the tests just to confirm your LPR.
Never underestimate the mind's ability to cause weird things to the body. Even if I manage to effectively treat my LPR problem, I still acknowledge that part of it is emotional and anxiety related, and its not totally physical. And I even think, my mind is partly in control of how much mucus I produce.
Here's an example of that. When I had a cold, my nose wouldn't run until I entered a class room and got stressed out there, listening to the lecture. Then my nose would really start to pour. So isn't that just my mind causing some real physical problem to become worse? And my ongoing gagging when I was nervous. That was a physical thing that would just happen to me, but it was totally regulated by my emotions.
You need to get on something that will relax you. Pick your poison. there are a lot of them out there. I find getting drunk once in a while can sort of regulate the nervous system. Maybe try that a few times and see if it sort of rewires things or depresses your overactive central nervous system.
We all need medications. Even people who jog are just getting a natural one.