Hypertension 48 male. Readings are high.

Hi I am 48 male having intermittent hypertension for the last 13 years. I mean I experienced high BP only when some difficult situations arrived ( mostly business related ). My BP goes in the range of 135 -140 and 85 - 90. In bad situation it becomes 150/95. I take Tellzy 20 and BP comes to 120/80 within 2 days, then I continue the medicine for some time and then stop. I keep on checking my BP and whenever I finds it at higher levels I start taking the Tellzy 20. Can I continue this way......... Note - my height is 5'7" and weight 70 kg. I do walk and exercises 4 to 5 days in a week My blood reports are OK except some numbers are out of range in Lipid profile. Pl suggest should I take Tellzy 20 regular or should I stop it and try to control naturally. Or can I take only when BP readings are high.