Been noticing lately I'm having a lot of erratic heart beats. No big deal. also, when I ride on my bike and do this particular hill, my hr shoots up to the high 190's even over 200. I stop and take my pulse and it doesn't feel like a 200 plus rate. So I stop and wait til my hr settles down and continue the ride. I do hills after this one with no apparent problem. During the episodes my legs are weak and breathing becomes labored. Each time this has happened I've stopped and the excessive hr has gone back down to almost normal. I am on clopidogal, pravachol, carvedilol , apixiban, and tikosyn. I have been diagnosed with paf. This has me completely baffled and concerned.