Treadmill Stress Test vs Chemically Induced Stress Test

Two weeks ago I had a treadmill stress test. It was a nightmare. My heart was beating so fast that I could hardly breathe. I asked to get off and they kept telling me just a little longer. Finally, I told them I was going to pass out and they let me off. I didn't stay on long enough. I was really scared to go back to have the chemical stress test but I have to get cleared by a cardiologist. Yesterday I had a chemically induced test called stress pet scan. It was the total opposite of my first test. Just lay still for about a half hour. Machine kept taking picures. The last 10 min they injected me with something to make my heart beat faster. I had no bad reaction and could have slept through the test although I don't think they want you to. My point is to try to get the chemical test if you are morbidly obese, older and not in good shape. I had a lot of people tell me the treadmill stress test wasn't that bad and I could do it. I really tried but for some people like me we should have the chemical test.