Talk to Cardiologist on Cardiologist Low Heart Rate

Hey all respected doctors, from 9 month im suffering from high blood pressure bp was 150/90 all test clear reason of hbp is severe anxiety due to death of loved one Dr. prescribed me atenolol 25 mg at that time my resting pulse is 120 - 130 in severe panic attack moving on now im perfectly normal I do regular gym workout and lost 6 kg in a month now I use half of atenolol 12.5 still my bp is on lower side like 105/60 with a pulse 51 now im really scared why my pulse is always on 50s at night or 60s in morning although I have no symptoms at all please give me some advice is there anything about to worry? Should I stop taking atenolol now?