I have the same issue, my doctor says its normal just keep drinking water and eat plenty of food also rest. I keep bottled water with me at all times to prevent fainting spells
I have been! They are saying that I must have a nerve our large blood vessel that's being squashed. They told me when I start to feel it coming on to try to breathe deep, lay on my side if I can get to it and possibly get my feet up...also to try and snack every few hours especially on fruits and protein. I fainted yesterday while laying down during an ultrasound, I woke up with 3 drs a nurse the ultrasound tech and my fiance all trying to get me situated...hopefully this helps some!
Have you talked to your doctor? Continual fainting is not good