You are one strange cookie, plommer.
I'm an old man, majormt, and colonscopies have become regular for me. They've improved the 'cleaning out the night before process' over the years. Ask for the atomic stuff, powder form in a gallon container, fill with water, drink at least 64 ozs of the stuff and I'm clean as a whistle after that. Last time I dropped 4 lbs during that process.
They knock me out for the procedure, worst part used to be the night before but now I'd rate the 'hangover headache' the day after from the anesthesia my least favorite part. Make sure and ask for copies of the photos that take of your intestines/colon. I sent a couple to
Nurse Ratchet at the hospital where I had the CT scan and that since she was such a bitch. Enclosed them in a Christmas card last December and signed it, "Hope your holidays are the shits."