Done it once(2 yrs back) as my dad had polyps found so me and my sis needed to follow up. Its not that big of a deal. They put you under but just enough to make you sleepy, pretty sure I remember waking up and watching the tv screen for a few seconds before I drifted off again, no pain or discomfort after.
WORST part is trying to drink that slop. If you can, get an appointment where you drink all of it in one shot, go that route. I had to drink half in the evening, sit on the crapper, then worry all night if you had to go again. Then drink the rest by 8 am the next morning, do it all over again. I don't believe any flavor will help get that junk down. I had to wash it down with ginger ale near the end.
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