Lucja, I have gone through something similar to what you are going through. It's been years ago but I had something bad happen to me. (Grandfather died of a heart attack and I found him not long after he'd passed.) I was very close to him and his passing hurt very much. I was told by my parents that both sides of my family, (Mom and pop's) have a high deathrate due to heart attacks. I smoked cigaretts at the time and my parents tried to scare me into quitting by telling me I was going to die of a heart attack some day. Guess what happened? I started getting these occassional bouts where I thought I was having a heart attack. It would scare me and make my heart race thereby only further making me think I was having a heart attack. Also, I would get these strange feelings like I needed to run. Like I was scared of something. But I didn't have anything scaring me at the time. The feeling to run would just come and go from time to time. In the end it was anxiety brought on by the stress of my life. I was able to get past it on my own without a therapist but it wasn't a conventional nor recomendable thing that I did. Over the years since then I have found that stress can do strange and frightnening things to the body. If you haven't seen someone about these attacks you are having then I highly urge you to do so. I'm not saying these attacks are going to kill you but I DO remember the fear I was in when I had them and I feel for you. I was in my twenties when I had these attacks and you are much younger than I was. Really though, you have something eating on your subconcious that is causing these attacks. You might not even be aware that something is bothering you. So again, please seek the aid of someone qualified to help you deal with this problem. I wish you only the best.