Feel like Death just tapped on my shoulder?

ok first you gotta calm down and try to take your mind off it. It sounds like a panic attack to me, and the more you think about it the worse it gets. Its not an issue where you should go to a hospital, calm down, take deep breathes and relax. Trust me you are not gonna have a heart attack its all in your head. I have had similar experiences, but yea im about 90% sure its a panic attack... Try some xanax or klonopins if worst comes to worse.