Do your doctors think there is some type of problem? I don't think a colonoscopy is the routine way to check for ulcers or Crohn's disease (have they done blood work 1st, like a CBC or a C-reactive protein test to check for inflammation?), and why do they think you may have colon cancer? I do hope everything turns out well for you though. I think the general age for a routine colonoscopy is 35 or 40, so I still have some years before I have to worry about it. I have a picture of one in my medical terminology book, and it doesn't look fun at all, but I am sure you will be sedated, and the last time I had surgery + anesthesia, I did not remember anything at all.