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I had a disease that predisposed me to colon cancer, so I've had 6 or 8 colonoscopies. I never liked the preparation (flush out the bowels), but the colonscopy itself was always oddly fascinating. I'd get as little anesthesia as possible and watch the view of my colon on the tv screen while chatting up the doctor and nurses. The highlight for me was always when they turned the room lights off and the scope light up so that my belly would glow red. The whole procedure would be slightly uncomfortable but not painful.
Few of the letter writers addressed the rectal cancer part. I don't know if J is getting chemotherapy, but here's my condensed advice, based on two separate sets of chemotherapy.
1) Chemotherapy sucks
2) Buy an iPod
3) Buy a tivo
4) Reduce your daily goals to taking a shower and emptying the dishwasher. Everything else is just a bonus.
Good luck.
Steve