Heart gastric anxiety?i?

I have had a heart attack and I do suffer from gastric and aniexty problems. I went to my doctors for over a year about this and next week I finally have an app for an endoscopy and they are also suggesing a colonoscopy. I am going for these test because I think diffrent medication is causing this. I am not heavy in weight but loosing about 40 lbs has helped. Unfortunatly eating healthy can cause lots of gas in the stomac.