well all this info is helpful, but u should see your doctor to check u for any heart problems as well...

In ER they took pictures of my chest and did some scanning and whatever they do in such cases and the doctor came in and said you and your heart are healthy as a horse! u probably have had a severe anxiety attack which made perfect sense to me since i had not slept for like 3 days in a row due to school deadlines and exams after spring break and had not smoked in like a month prior to that so i had a bad reaction that day

my heart beat was @ 200+ when paramedics arrived and then b4 they give me anything and while i was deciding if im gonna die or i should take the ambulance ride, it slowed down and went back up again a few times while i had a feeling of pressure in my chest and kind of a "hotness" feeling as well

since it turned out to be "nothing" at all but an anxiety attack due to a mix of causes, everytime i smoke and get the same (but much milder) feeling i just ignore it and dont pay attention to it... it goes away b4 u notice its gone!:thumbsup: