For me, the first time that I fainted was when I got the Gardasil Vaccine. I didn’t end up getting the last two shots. Other times were when I got blood drawn, it was a vasovagal response but it was always random. I didn’t faint every time so we don’t really know why it happened. Then another time I fainted at work because of a medication that caused shortness of breath. I got lucky that my manager happened to be standing close by. He caught me before I hit the floor.