Injected friend did proper steps...Left cheek...first time we hit a vein so i took the needle out and we replaced it with another one..i then re-stuck him(not in the same place) drew back there was no blood so i injected him...he passed out right at the end but then came to like 2 secs after right before i called the paramedics. He's feels like shit but is doing fine...this happened like 5 min ago...Any thoughts? should he go to the doctors?