I have PV and have been on daily aspirin and hydroxy since March. My first venesection in February was no problem, the second was also fine but with slightly reduced blood-pressure at the end. I confidently attended hospital for my third yesterday morning. I've never minded needles and I'm not squeamish about blood. What could possibly go wrong?
The following is not meant to alarm but simply to share my experience, on the basis that more information may be useful for someone somewhere!
After 25 minutes, they had taken the full 500 ml. I had started to feel a little light-headed and blurry in one eye when, quite quickly, I started to feel very dizzy, my vision went blurred, I felt confused and sick and I fell forwards. My pulse had apparently gone down to 32 pm.
The response was rapid and excellent: oxygen, atropine (be sure to look this up: belladonna, with very marked side-effects) and off to A & E for the rest of the day. Two new words: bradycardia and vasovagal. I seem OK today, DG.