heart racing

hi, i've had panick attacks for about a year now. and i've had some trouble with my heart and stuff. every month or so i have a big panick attack. The thing is that im not scared at all....my heart goes super fast and it beats really heavily in my chest. I know im not going to die from it but every time i keep having one of these big "episodes" my heart races longer than the last time. The first time i had it, it was only 45 min...then the next was an hour and the next was 2 hours.....and recently its kicked up to 3 hours straight of doing this.....and im calm and everything....i usually can make my heart go as fast or as slow if i think about it ....but i can't seem to get it to go down to normal rate...so im worried if i go to long on this hypertension that my heart will do somthing bad...and im wonering if it has some problem in my neck thats causing it? cause i heard that it might be a problem in the brain stem or somthin....but idunno......the only thing that concerns me is that i might get panick attacks every now and then but when i have these...im not scared at all.....unless it keeps going on and on and onnnnnn....i feel like im about to pass out.........but i don't...so yeah..and no one around here knows how to trigger where im getting my panick attacks, and what the heck im so afraid of. The therapist i went to could only find a bunch of little problems spread out everywhere when we were trying to find the root of the problem. And the problem is becoming more severe...mabey i have to much stress or somthing? cause i have no idea...um yeah thanks for readin this :D

You may want to consider if you have IST.  I'm not certain how old you are but I am currently being evaluated for it.  I know that it's more prevalent in women between the ages of 25 - 45.  Irrational Sinus Tachycardia means that your heart beats at a rate of at least 100 beats per minute for no apparent reason (resting) and can get way up with even the slightest activity.  I was recently put on a beta blocker and am wearing an event recorder to determine if this is what I have.  I have a stress echo scheduled for this week also.  Apparently it's not an issue that will kill me and it's something that can be controlled with medication.  Perhaps this is something for you to consider.  Good Luck!

Liz