I know that this is a late reply, but I experience the exact same things you do. I''m a teenager, and I get a rising gas pressure in my chest that goes to my throat, but then goes back down (its not exactly relief though when it goes back down). And this cycle continues and builds up. If I am unable to lie down (which seems to make the gas travel down my intestines where I eventually fart it out), they it builds up to the point that I will violently vomit nothing but air and massive amounts of saliva. Throughout these uncomfortable symptoms, I am producing copious amounts of saliva for some strange reason.
These problems do not arise all the time, but like you said, they almost always trigger when I am nervous. There are times when I have had to play in a 2 hour concert (extremely nervous) with the gas pressure continuing to build and build.
The worst part is that its not a known disease and doctors don''t really prescribe anything to solve the problem. I''ve replied to various other threads of many people complaining of the same symptoms, so know that you are not alone.
People who do not experience this often take this problem lightly and often humorously. Because when we do stop to think about it, our problem does seem pretty pathetic. I tell people all the time that I cannot drink soda. If the symptoms do arise, I seem like a weak, pathetic boy who has to, for some reason, lie in the middle of the floor to alleviate the crushing pressure that is building in his esophagus. And hours or even days later, he will release these huge amounts of gas through his backside.
So, all in all, I feel your pain. I''ve gone through all the tests. The doctors assumed it was acid reflux, which I knew from the start that it wasn''t, and I had an endoscopy. I even had a barium x-ray test done, but neither showed any problems. As far as I know, I know of no medical procedure that can fix this problem. I read in another thread that the problem was called the Schatzki Ring (google it), but this problem is often detected in liquid barium x-ray tests, but this was not found in my test.
So I''m desperate and still afflicted by this horrible disease. If anyone, at all, has any solution. Please....help.