Yeah, a couple of times, actually. The first time was when I had a fever and my mom made me stand up in the bathroom so she could do my hair. This was about 2-3 years ago, and I do my hair by myself now. xD I started feeling really dizzy, so I sat on the edge of the bath tub. Then the stars came, and I started running toward the queen sized bed. I lost my vision so I ran into the door and hit my head. Then my mom guided me to the bed, and I climbed up. Then my vision returned. It was really scary, especially since I was so young.
The next one happened at the puberty assembly in 4th grade. I felt so sick after talking about it for the first time, and I'm guessing my head dropped on my friend's arm for 2 seconds. When she moved her arm, I woke up. I was all sweaty and cold, but nobody noticed I fainted. xD It was also scary, and I should have told the nurse.