Thanks so much for the replies.

Yes, I exercise. I do intense, very fast walking for 60-70 mins on a treadmill most days. And, in fact, it's after doing exercise that I tend to get dizzy when getting up from a seated position, so, it seems, that it is especially after having done exercise that my blood pressure, and/or hr drop.

It sounds like you may be really on to something, BPCyclist and thanks for your thoughtful reply. It may well be that my resting hr is so low because I'm in such good shape. Though perhaps the propranolol exacerbates it, who knows.

I'm going to talk to my PCP on Tuesday and ask her about that. As far as I know, there were no other abnormalities on the EKG, only Bradycardia. I'd REALLY rather not change my meds around, I desperately don't want side effects, of some sort, from another medication; I've been so stable and without side effects on the regimen I'm on now.

I take 2 propranolol a day, so maybe going down to 1 will protect me from the tremors (they're in my hands and do really bother me). I'm starting with that, and then we'll see what happens. But I will DEFINITELY bring up the exercise with my PCP; I think I'm in very good shape and, as you say, that may be playing a big role in my blood pressure (which isn't always so low) and heart rate.