Hi, I’m 58 and was diagnosed with PV just over two years ago and put on HU Immediately. I too had extreme sensitivity to sun and also tooth pain. As months went on, I slowly adjusted and when the dosage was lowered those symptoms pretty much went away. PV can cause all kinds of nueropathy so the tooth pain still pops up occasionally. I get labs once a month and need phlebotomies every ten weeks or so. Good luck and good health!