please help

I constantly think I am gunna heave a heart attack. and I have gotten 4 ekgs and 1 ultrasound they said I'm fine I have also done blood work and brain scans.
I recently stoped getting chest pain well not all day like before and I have back pain now its driving me nuts. I always have my hand over my heart and think my heart is racing and ill go take my bp and its 122/61. and pulse rate aorund 77 till about 84 sometimes like 68 around rest about to go to sleep doctors says that better than normal and the more I think about my heart the more symptoms I get please help.

Johnny you will not have a heart attack, so many anxiety sufferers beleive they will, I did at one point myself, it scared the cr#p out of me. I did all those test too and they came out fine (except for the sinus arrythmia) so you have nothing to worry about, there is nothing wrong with your heart hon.

Remind yourself of that everytime you feel this way.
Racing heart can be calmed down by deep abdominal breathing, deep long breathe in and out helps too, do it until you feel your heart beat slowing down.