Hope all is well,
I have something very similar happening with me. Every day or so, I get a shortness of breath for a quick sec. Then I start developing burps that last for a few hours. I've had all types of tests but nothing obnormal from the results. I feel upper stomach near the osophugues feel very hollow. This has been going on for 3 years. Very frustrating. What's even worse is when I slouch when sitting, I feel a tight hot air bubble slowly creep up
Which is the worst feeling ever because my whole body gets in stressful situation. I ve had all types of test done including endoscopy but all looked good. I was also told it was anxiety and stress by the docs which I doubt since I really don't feel stressed. Just thought I'd share and see if someone had a similar experience and a possible solution.