When I had them more frequently, I was told it was sort of my body's reaction to pain. My doctor (the one who saw me pass out) had actually just done a very minor out-patient procedure on me and I was really not feeling well, and I told him, "I think I am going to pass out!" And then I was OUT. The times I've had the episodes, it's really been when I was in extreme amounts of pain, usually in combination with something else - like pain plus being sick or pain plus being very tired. Rarely is it just pain.

As I said, it's been about 3 years since I had this happen. It was much more common when I was younger. Maybe I grew out of it some, or maybe I learned how to prevent it some with the focused breathing.

I'm always around on FB if you want to chat more.