Beta Blockers help control your blood pressure. PERIOD. Not your heart rate. To totally control your heart rate you might need what is called an ablation where the problem nerve is eradicated via electrical burnout. The procedure is only used in uncontrollable conditions and you must be observed for at least 5 hours afterward, sometimes overnight.

Maybe you should look on the web to learn about Beta Blockers.
I've had a Quadruple Bypass, and had a PVC (Preventricle Contraction) problem corrected through an ablation. It was activating 20 times a minute and depriving my brain of the necessary blood to continue functioning. Occurring 20 times a minute is not conducive to proper functioning of one's brain nor of the heart that got plugged enough to present with the signs of a heart attack; profuse sweating, shortness of breath, extreme fatigue. Coming home after work, sleeping 2 hours, then getting up, fixing dinner, eating, going back to bed and getting up 6 hours later to go back to work.

I also had, in the past been on Lisenopril, and ACE inhibitor. Did nothing to help with any problems I was experiencing.

Please look up information on your medication and ask your MD as many questions as necessary to get the information that satisfies your mind. Your kids need their entire dad's attention and these health problems leave so little time to devote to your kiddos. They will be there for you all the way.