First off, what was your bp before taking the med, and were you taking it just for your bp or elevated hr as well?
I ask these questions because bp meds are terrible in the first place, but atenolol is one of the worst! I was on it for maybe 6 weeks, and it really screwed me up. Now, I'm off all bp meds, and my bp is nicely under control.
Thus, maybe, if it's just your bp, and it wasn't too high in the first place, maybe you can get off of it, too.