I was diagnosed with POTS when I was 18 (am now 35) at beth israel deaconess. had tilt table tests and then repeated all this a few years ago again at BI. I just started a bp diary for my CFS doc and after a week noticed that my blood pressure stays pretty stable but it's my heart rate that increases by about 40-50 bpm on standing. I always thought it was a drop in BP that made me feel so dizzy but apparently it's the heart rate. So she took me off florinef (since it wasn't working anyway) and wants me to take a really mild beta blocker called pindolol 2.5mg but I'm really reluctant. The one time I was put on a beta blocker, I fainted all the time and felt so tired and weak. Does anyone else have a similar situation or advice?