Whenever I do any kind of aerobic activity, I get an unbelievable headache. My hands swell and the headache will last until the next day. My face will also turn red. I do not have high blood pressure but I do take effexor xr. My Dr. said that this would not cause it but has no idea what does. The headache is the same as when I get too much sun. I do not want to stop excersising and I stay hydrated before, during, and after.