if you can't do it, i will do it for you! seriously, i would love to do it!
perhaps you could just take potassium, iron, multi vits etc before hand to ensure, and get the doc to write you a note to say he feels you are fit enough.
though if you fainted in the air it could be very dangerous - god knows what would happen to you, as although you are strapped in, you have stand firmly upright in a certain position etc
if your mouth was open and you were unconscious, the wind speed could make it very hard for you to breathe
are tandem ones possible?
good luck