I'm getting a colonoscopy and i know versed erases your memory. is there an alternative?

Excellent drug: Midazolam or versed is a sedative- hypnotic with amnestix qualities. It does not supply retrograde amnesia so it does not erase your memory of events already passed but gives antegrade amnesia so you may not remember what happens during the procedure. If you want to be aware if the procedure and remember everything, doing it wide awake and without any sedation is the only sure way.