Hi, Sir, I Take Everyday Olmesarton 20 For BP But

Hi, Sir, I take everyday olmesarton 20 for BP but before two days all of sudden my BP rised to 156/97 in the evening .Then I took one tab of olmesar 20 ,even then my bp did not come down after two hrs.I went to apvt Hospital at night to check up from a doctor .He advised me to do ECG in next day after giving some medicines. Yesterday I went for ECG and my ECG was normal but Bp was 160/100 at 17:00 hrs. Doctor checked and changed my medicine and gave Aten 50 for 10 days . I have started from today itself.Please advise me.
Thanks
Anita
(my age is 51 yrs)