My 15 y/o daughter faints everytime she has blood drawn or a shot. She is on medication for acne and needs to be drawn every month.She has fainted 2 times with that and just yesterday when she recieved a vacination shot. out cold. BP good, health history, normal, blood sugars normal.Is there anyting I can do to prevent them? Next month she goes again. The first time it was right after the blood draw. Second time 5 minutes later, third righ after shot with a severe hadache ad ringing in the ears before and after, then boom gone, and she is ok after that, just embaressed. anything?