Some people can tolerate colonoscopies when awake, some can't. I've been awake for the three I've had done so far - it isn't comfortable but it isn't that bad either and I can walk out of there and go to the nearest Denny's afterwards.
Yeah, I asked the last doc to skip the sedation . She said no, she's not comfortable with it.
I'd get another doc but it's such a pain in the ass!