Please Help Fast. Me it's probably h.

I am 34 year old male. I have a bit of a high cholesterol. I have a sedentary life, though improving now. I am also overweight. I have been facing an issue for the last couple of weeks. I get this strong bout of bloating, burping, heart palpitations followed by feeling a bit weak and dizzy (not too heavy), but scary. It happens once or twice a day, sometimes after meals, sometimes when I move fast. I also wake up short of breath early in the morning and which goes away when I shift my position Other than that I sometimes feel nauseated and bloated early in the morning. I have met many doctors - Gastro as well as Cardio. All have given different reasons. One dr. told me it's just a gastric issue, one told me it could be GERD, one told me it's probably H.pylori and the cardio told me it's because of Obstructive Sleep Apnea. I am scared about the heart palpitation and weakness/dizziness that happens with excessive bloating and burping. Please help fast.