CFIDS and Colonoscopies

I guess I should start by explaining that I have a genetic predisposition to colon cancer. My mother died from this terrible disease at 55 years of age - when I was 21, almost finished college. Good thing I only had a month left before graduation or else I would have flunked out - just didn't seem as important as it had before.
So, I need to get regular colonoscopies. Problem is, with CFIDS, the preparation and the anesthesia make this at least a week long event. Hard to get yourself psyched up to take an entire week off to get one of these done - but I did this past week.
Worked and started prep Wednesday night. They don't use that fleet stuff anymore, instead you drink about 64oz of some other stuff. That's about 8 glasses or so - A boat load of stuff to drink that has a cumulative effect of producing more and more nausea. The first 4 glasses were ok, but once my stomach started getting nauseous, it got harder and harder to drink the stuff, until I just couldn't drink anymore. About 2 hours after I finished, the nausea got so bad that most of it came up instead of doing what it was supposed to do. Now what do I do - can't or won't start over! Decided I was "clean" enough to go for the procedure. No food or meds that day/evening kept me up almost all night and gave me one of the worst migraines of my life - not sure if the migraine caused the vomiting or the other way around, but it was a very bad combination. Only been that sick a few times in my life.
So I went for the procedure, and other than 1 polyp, came out fine. It's Saturday evening now, and I still don't have my strength back from the draining earlier this week, and I have to start my CFIDS treatment back up on Tuesday - IV's and injections. Then I start the heparin back up, which is a twice daily injection just like insulin for diabetics. Not hard, but it does get to hurting after about a month there is no place you can put the needle that isn't already bruised. But, I guess I'm being a baby here. Don't want to turn this into a complainer's pulpit, so I'll get to the point. I've had 2 colonoscopies in the last 7 years, and because the experience didn't improve much, I think I' ve had my last - I won't say forever, but certainly for a good long time.