Another heart worrier here too, among other things.
Funny thing is I had not heart related incident in the family (parents, grandparents, cousins, etc all have no history of heart disease).
When my anxiety/panic disorder developed, somehow it got into my head that might have heart issues and it just went from there.
At the onset of anxiety/panic (4-5 years ago) I had serious issues with palps, they scared me to death. So instead of a crazy diet I started working out (P90X worked wonders).
Did it at home, alone (sadly, did not help much with the anxiety/agoraphobia) so that I would not freak out and did my best.
While I'm not even mildly concerned about palps, as soon as I feel a sudden sharp pain in my chest I always think my number's up. Mostly I manage to get away only with a mild anxiety attack but sometimes it turns into full blown panic (once every year or so).
I recently had such an incident while driving home in 95+ degree heat, with the AC on. I was already stressed out, had some icecream and some cold drink and
BOOM! Short, sharp pain in the chest and I thought I was gonna die, panicked right after (hyperventilated, tingling in arms/face, all the fun stuff).
And I still had like 90 miles to drive!
And you know, I don't really fancy heat :) Even thinking it's above 85 outside makes me feel anxious.
Anyway, made it home, even though I felt like fainting, dying and whatnot... but here I'm telling to story.
I had 5 thorough checkups in the past 5 years (EKG, doppler echocardiography, 24h holter heart monitor, you name it) and everything was always OK, no issues at all. On the contrary, the 2 years ago I was in such good shape that my resting HR was around 60 during checkup (despite the usual anxiety during checkups which always adds a few beats, sometimes more than I care to admit) and I was told that my hearts fitness level was that of an average athlete.
The only thing the doctors ever found(tried to go to different ones every year) was an EKG anomaly that showed up the 3rd year and did not show up last time I had some checkup; and it was some really minor issue, nothing to worry about.
Thing is, people with health anxiety issues blow up every little symptom 1000%. Also we tend not to believe our doctors. But the more you go at it in your head the worse it will get.
If you have no mineral/vitamin deficiency, just start exercising (weighlifting/bodybuilding in the gym is not the best, try something else, like cycling, swimming, running), do it at your own level and be honest with yourself. And the palps will go away.
And believe it, with heart anxiety in 99.9% is all bark but no bite. And you are not in the 0.1%. And I know it's not easy to accept this, even knowing all I know, once I have a panic attack, I forget everything, but the trick is to try to remember what needs to be done, and little steps at a time deal with it :)