I have the same problem. I have sometimes gastritis that can last up to 2 weeks where I'm unable to eat coz I feel so sick... I have no acid reflux just a feeling like there is an inflammation in my stomach and that I cannot burp properly. I've been put on Nexium for a year which has done nothing at all! Gavisgone is useless, ranitidine too! there was a time whenthe product Alkalal worked really well but then it did not work anymore, then I tried Regulat, again it helped for a few months then it stopped working. I had endoscopy, colonoscopy, barium eneama, breath test and blood test for H.Pylori... all negatif! Tried gluten free diet, sugar free diet, dairy free diet, FODMAP...you name it! I got so skinny coz I could hardly eat anything that I lost 9 kgs. My Dr thought I was anorexic and most of the time they did not believe that it was the pain that was stopping me from eating. They tried painkiller, anti-depressant (amytryptilline) for the pain, nothing worked!
Since August I have been put on big amounts of laxatives which did help massively, I was able to eat any types of food and gain 6kgs
I'm fed up! this pains is unbearable.... it feels like I'm going to be sick anytime but I'm not and if I throw up I usually don't stop so I need 2 injections from the Dr. to stop me from throwing up. A real nightmare
So I do empathy with your pain and problems. It's a nightmare. I am also diagnosed with POTS and chronic Lyme disease so I'm not sure if the other condition is giving me trouble in that department.

