Hi IDK, Welcome to HealingWell,
I see you made 3 posts, one about pain in your right hand, on the top, the second about having trouble breathing under exertion that you attribute to Asthma, and this one, with rapid hear rate when you're resting, odd pulse at times, and a reference to Blacking-out. How long has this been going on for?
Even if there was a doctor on this forum, he/she could not diagnose you properly without examining you and possibly ordering tests. If I were you, I would schedule to see a doctor just to rule-out anything more serious. Your Family or Primary Care Doctor would be a good place to start, he/she could refer you as needed to see a specialist. If you don't have a doctor, call the local hospitals to see which may have a clinic or program to help you get care.
If you develop other symptoms (shortness of breath, crushing pains in your chest, pains radiating down your arm or up your jaw, sweating without cause, etc.), or if these symptoms just started today, I would suggest that you should be seen in the Emergency Room.