I'm on three high blood pressure meds. I've been on them since I was 30 years old. I'm 50 now. Anyway, on most days, my BP is about 140/80., but sometimes it goes a lot higher. However, when I'm active for an extended period of time, my blood pressure drops very low 105/60 or so. I get exhausted, light-headed, etc. It's odd. It's very difficult for me to engage in physical activities because of the drop in BP. Any explanations?