How to get your heart rate down
I think you meant to say how do you get your heart rate down... it seems by your post you might have been rushing it stop drinking energy drinks?... just kidding... close your eyes and think and focus on something realy boring
I believe becoming more active physically will lower your heart rate. If you want it slowed instantly, I don't know what to tell you.
relax your self completely
Over time, exercise will make your heart stronger so it doesn't have to beat as often. In the short term, try avoiding caffeine and chocolate.