Hello, I am writing to try and get some input.. or help. about a year ago, I was walking down the street when my heart just randomly started beating out of whack. I freaked out, and that made it even worse. I hadn't had another episode, until last week. I was at work, sitting down.. not even moving and my heart started going nuts. Good thing I was close to a hospital. My heart rate was steadily in the 160-170 range. It has been 5 days since that episode and I find myself afraid to go to work, afraid to walk up the stairs (that causes my heart to beat very rapidly) and afraid that it will happen again. 

Also, for the past 5 days I have not been able to catch my breath. I feel as if i'm not getting enough air.. I have to constantly sigh or yawn, or cough. I get dizzy, and feel disoriented. 

When I sit down too fast, or stand up too fast, or walk my heart goes nuts. 

I am really freaking out here, and could use some advise, help, comments. 

I am 22 years old, healthy. I don't get it?!