I have to have annual colonoscopies because I'm a one-woman polyp factory. I do understand your concerns, but there's no real need to worry unduly. You will be offered sedation, which helps a great deal. I was very lucky to find an endoscopist who shared my love of jazz, and he used to play some recordings for me during the procedure. The nurses are always lovely because they expect people to be anxious. As you might imagine, I have become very used to colonoscopies, and usually watch the screen as the camera works it's way round, but, of course, there's no obligation to do so. Like mammograms and smears, I see them as a necessary evil. I'm sure you'll wonder what you were worried about. Good luck.