My Doctor Has Prescribed Coversil Plus To Go With My

My doctor has prescribed Coversil Plus to go with my regular Atenolol. I have been experiencing dizziness when arising from a sedentary position - having been there for approx 20 minutes. Would this indicate too much blood pressure medication? I am 69 yrs old and was diagnosed with a small stroke in 2000. The symptoms were the same then. I am reasonably healthy but am becoming alarmed. I did have an MRI in 2000 and that was the diagnosis. I have NO symptoms since I was taken off Premarin in 2001. Thank you!