No but I almost did twice, and they were somewhat recently.
About a year ago I went to get some blood work and I hate blood, and they had to take a good amount of it out of me and I started feeling woozy and was probably a few seconds away from blacking out.
Maybe 6-7 months ago we had a school assembly about drunk driving and I was part of the group that didn't have an actual seat so we had to sit on the ground and it was so uncomfortable and I was sitting there criss-cross applesauce for so long, it was exhausting on my legs and I was just shaking and feeling so much pain, and it was crowded so I couldn't really sit with my legs out or anything. At one point I just started feeling numb and that I was gonna pass out.
Almost fainted once, during a practice I was exhausted but had to keep going. My vision started going away and at one point it was just all black and I couldn't see, so I just ran out of the room blindly, sat down and drank some water.
Inhaled to much helium from some balloons after a birthday party and was walking and then just fell and I guess I came to like ten seconds later with my dad trying to wake me up.