Seizure due to having a needle?

My son in law had to have blood work done and from past experiences in which he fainted, he advised them to take his blood when he was laying down.  He looked at a game video during the procedure and tried to ignore what was going on in the lying position.  He fainted twice the nurse told him and had spasms that resemble a seizure and even urinated on himself and also turned blue during the "seizure".  

He can hunt and gut a deer in the bush and watch his wife give birth to their first child.  I don't get it.  It is just a needle.  Any suggestions for further blood work?