Why does blood pressure change inspite of having drugs?

Hello doctor,

For three years, I have been taking 12.5 mg of Atenolol and 80 mg of Diovan to control blood pressure. Readings over the years have been good and average. 120/60 mmHg was the blood pressure 55 to 60 bpm was the pulse rate. I have a good blood pressure monitor, and I take readings three to four times a day. Last month while taking a regular reading, we noticed a reading of 136/60 mm Hg of blood pressure and pulse 32 bpm. A few minutes later, the bp was 141/68 mmHg and pulse 32 beats per minute. We went to the emergency room at the local hospital during a trip that took about 25 minutes. The readings had gone up to 60 bpm, and the blood pressure readings were satisfactory. I was in the emergency room for about 12 hours, where they did several blood tests an ECG and a chest X-ray. I was discharged the next day because they said my condition was fine and they recommended dropping the 12.5 mg of Atenolol completely. (I am attaching a 24 hour Holter monitor report that was done two or three days later). I took 0.4 mg of Flomax for 18 days for BPH. The readings were normal from the last month till the mid of this month. Then suddenly on a fine day, the readings of pulse rate and blood pressure were high, so the family doctor recommended resuming the Atenolol at 12.5 mg. After four days, we then found that the pulse rate was going down into the 30 bpm again, so the family doctor recommended cutting the Atenolol in half to 6.25 mg after which the readings of the pulse rate were high 30’s and blood pressure going up to 191/85. So the family doctor recommended taking 6.25 Atenolol in needed basis if the pulse rate and blood pressure started to spike. So we monitor blood pressure and pulse rate each morning before we go out to see if it is necessary to take the Atenolol and it is very stressful.

Thank you doctor,

The pulse and blood pressure now seems to have stabilized and become more or less regular. Although without the Atenolol, the pulse can be 10 to 15 beats faster at times. I have stopped taking Atenolol before two days. I am sending separately to you a recent Holter monitor report and a 24-hour blood pressure monitoring report. I feel fine and do not seem to have any symptoms of cardiovascular disease. The Flomax was stopped as well. I need your opinion on these reports and specifically whether everything seems to be alright with the cardiovascular system? Also, should I be taking medicine to replace the Atenolol for the higher pulse rate at times? I am scheduled to do a TURP procedure for BPH on next month, am I healthy enough for that procedure?