I've been on this med since 1/28/10. I was on a lower dose for 4 yrs before but doc doubled the dose to 160/12.5. On Friday I started to shake all over and felt really tired. My BP in the afternoon is around 119-114/72-65. Is this too low? I take my med at 8 AM every morning. Not used to feeling tired! i thought at first it was because the temp outside is in the 80s and I'm not used to the heat here in PA. I don't feel any worse except the shakes which I don't like. Cardiologist is not in until Monday