Hello, i have been having blood in the stool, went to a colon doctor, they said it was not hemorrhoids, and that I need a colonoscopy. This was 2 months ago. I have not gotten one yet because I figured I was fine, cause I m 21. Although I randomly have what sounds like heart attacks, basically my heart starts pinching and I literally becomes immobilized and have to just sit there through it, I literally feel like my heart is shutting down becomes it can t pump blood through it. They usually happen very briefly like 4 or 5 seconds, but I just had one that lasted for at least 10 seconds, and I fell on the floor becomes I became paralyzed. What is happening to me?