My blood pressure is wierd man..?

The last week my blood pressure has been acting very strange. I'll be sitting at my desk for 30 min. take my BP and its 160/95. Then I'll go upstairs then come back and sit in my desk and without waiting take my pressure again and it'll be 145/85.. Up and down for no appearant reason. Same with my pulse. I'll be sitting at my desk for 30 min. take my pulse and it'll be 95, then 20 minutes later still sittin at my desk its 75. It's been doing this for almost a week now. My meds (atenolol, cozaar) seem to be doing nothing for me. What is going on here? Please help..