Yup, had a FS myself five years ago. The examination only covers the the bowel as far as the splenic flexure -like a right angle bend in your lower bowel . Hospital will have provided you with the stuff to use. Follow their instructions and you won't have a problem. Probably told you to drink only clear liquids for twelve - twenty four hours before the procedure. After you have used the suppository at the time they say, you'll have a good clear out quite quickly, then another about ten minutes later. After that, I was fine to drive from home to Royal Sussex - about half an hour - without any problems or embarrassing accidents.
The most uncomfortable part of the procedure is that you lie on your left side and they pump you full of air to get a good view. You'll feel the need to fart like never before! Otherwise, it's straightforward.
Good luck.
Yep this exactly , and oh boy didnt it feel good to let rip !