I also had problems this pregnancy and it was very scary. I personally decided that trying to have another baby wasn't worth my other kids not having their mom. I do think this is a personal decision; and you should speak with your doctor about it. Good luck! As lmc2132 said you should also post this in another forum where you could get more responses.
I had heart palpitations during my pregnancy, but quitting caffeine fixed the problem. I would check in with your heart doc before trying for another baby. Heart issues can be very scary, I know. Also, you may want to post this on the Pregnancy 18-34 or heart forums for more responses...good luck!
-LMC