Hypertension and High Cholesterol.

I was diagnosed with Essential Hypertension (90/140) and high cholestrol in January and was put on Telma 20. I believe it was mainly due to my sedantry lifestyle as I was consuming too much alcohol and fatty foods last year. Since January I have changed my lifestyle and exercising almost 1 hour every day 5 days a week. During repeat test of cholesterol last month, cholesterol got almost in required range. I have lost around 15 kgs (82 kg previously 98) and about 20 days back I noticed that my bp is low(105/65 to 115/75 on an average). So I lowered my dose to 1 Telma 20 every alternative day (skipping one day). From last 20 days of dose adjustment my resting bp is in range of 110/70 to 115/75 on an average. I do feel low bp while exercising like I feel pressure in my head/diziness during cardiovascular activity. Please advise?