Should I take beta-blockers?

Hi guys, I hope you don’t mind me posting this in here, I did post this on Youreatopia as well. I would like to have different opinions on this as I’m not sure what to do about my problem right now. Anyway, here we go:

I’m a year in recovery from three+ years of anorexia and I’m still experiencing some heart problems, especially very fast heart beat. It’s often over 100 bpm at rest and when I’m walking or showering it’s sometimes about 200. I know that my frequent mini-relapses don’t allow my body to recover properly but I’ve decided to stick with the minimums for now and have gotten to 3000 for two weeks now (although my minimum should be more like 4000, I feel so much better there and also I can’t sleep at 3000 without Opamox but it’s hard to get there without eating lots of candy everyday). But this fast heart beat is ruining my life, I can’t really do anything without my body getting to this stress mode, I get out of breath and dizzy etc. I’ve read that these kinds of heart issues should resolve by eating and resting but all of this is making me crazy. I don’t want to put my whole life on hold for this and was wondering if it would really be beneficial for me to take beta-blockers, at least when I do something other than rest at home. I’ve been prescribed Bisoprolol and Propral for arrhrythmia and I’ve taken them sometimes but I’m not sure if it’s a good idea. Does anyone have any experience on this? The reason I’m asking now is that I just came from a shopping trip with my friend and when I got home my heart was pounding like crazy (more than usual) and it took like 30 minutes to calm down to “normal” so like 100 bpm. It was fun to be out of the house for a while but am I risking my life doing things like these? It feels as if I’d run a marathon now. Anyone on beta-blockers?