About a year ago, I had experierenced belching up gas for almost a hour. I thought it was over and laid down. That made it worse, I ended up throwing up all the gas that I was belching. Couple of months after that, I felt as if someone was sitting on my chest and I couldn't breathe. I went to the doctor and they gave me a stress test, it came out normal. Now for the past few months I have been seeing blood in the toilet after a bowel movement (not constipated) and on my tissue.