Hi! Good questions! and you will definitely want to take them up with your OB! Your OB is likely to send you for a consultation with your cardiologist too.
First of all a couple of things to do to help reduce the frequency of episodes--you may very well already be aware that caffiene can increase palpitations, and have probably already cut down/stopped that. Cigarettes and illicit street drugs---same answer(hope its unnecessary to mention those!) Also, if you were
my patient, I would also want to test your thyroid and make sure it is functioning properly and your levels are within normal range. Finally, I would encourage you to stay well hydrated, avoid un-necessary stress and over-exertion.
Then, if my patient had done all those things and was still having problems, I might consider starting her on a medication like Propranolol which tends to regulate the heart beat, but only if she was having frequent episodes, and I would of course do this in conjuction with a cardiologist. (By the way, I"ll bet your OB will want those old records!)
Finally in a pinch, I have seen lots of doctors use low doses of Ativan on rare occasions in the second and third trimesters. I try to avoid just about everything in the first trimester, but in the second and third, after the majority of fetal development has already occurred, the biggest concern about Ativan is the addictive potential to the baby--your baby might go through withdrawls if you used it on a daily basis, but not if you only used it rarely.
One last thought, Buspar is a pretty decent medication if a patient need something daily for anxiety.
Hope this is helpful--