I am 21 years old now and when I was about 11 or 12, I fainted suddenly whilst sat in an upright position. I woke up after about 5 seconds and had a bad headache (probably cos I walloped it on something), it just felt like a hangover.
the doc said that there was nothing to worry about and that it was "just one of thos things". He checked me out and discharged me fine.
I'm hoping this wont affect the medical. It shouldn't because nothing like that has ever happened again.
Regards
Lee