Hi, stimi -- I think we've commiserated on some other threads. I have similar symptoms. I'm overweight and in my late 40s. Losing weight this summer has helped somewhat but I'm STILL not completely back to normal. My endoscopy turned out "normal." I was very surprised that my doctor did NOT find a hernia, because that's exactly what it feels like, as if my innards are pushing up on my diaphragm and lungs to keep them from inflating fully.
This idea of inflammation makes a lot of sense to me. I was consuming a lot of yogurt because I thought I needed the probiotics, but I've slacked off this past week and my symptoms have actually improved a little. Maybe I need to treat this like lactose intolerance too, see if that gets me anywhere. I eat entirely too much ice cream, and I like a dollop of sour cream on my baked potato.
My doctor told me he thought my large colon, the part that's in your midsection right behind your stomach and diaphragm, was probably inflamed from not eating enough fiber. So I've added fiber supplements to my regimen and am eating lots of salads. I feel better than I did two months ago, but like I said, still not back to normal. The weird breathing is the worst of it, but the belching is still pretty obnoxious too.
Hope we all feel better soon. It helps to hear from other people who have similar crosses to bear.