Well, I am still interested in what your athletic life is like, because some aerobic athletes (runners, for example) not uncommonly have resting heart rates in the forties or even high thirties. For them, this is no danger, cardiac-wise. It's just a sign of their level of fitness. It's actually a good thing, not a bad thing.

Even someone who just walks a lot could potentially have a resting heart rate in the fifties pretty easily. So, take that into consideration while you are evaluating all this. If you're an athlete, I personally would not give up the beta blocker--unless you are symptomatic (ie, dizzy or fainting, etc). I was running ultramarathons when I was on propranolol and my rate at rest was in the low forties. But I didn't have any kind of AV block, so we didn't worry about it. It was fine.

If you do decide to d/c the propranolol, you might look into gabapentin, which worked pretty well for my tremor when I was on Abilify. Ultimately, I developed tardive dyskinesia-like issues and so we had to stop the Abilify altogether. My tremor went almost entirely away, even though I am still on lithium.

Sending you positive vibes. Hang in there. You will figure it out.