I've passed out about that many times in my life as well. I'm very sensitive to dehydration and it can sneak up on me and drop my blood pressure enough that down I go. Happens maybe once every five to six years.

I don't have any crazy memories when I'm out. But coming back to, I always feel like there's something I just can't remember, it's just out of reach, at the tip of my tongue... and then my sight comes back and I can place where I am, but it feels like I've been gone for a very long time and am returning to the past, and then everything snaps in place and I'm back to normal.

Being put under with anesthetic feels very different. With that, I simply pop out and then pop back in.