Hi, I have been an endoscopy nurse and I'll endorse dianes post.
You could get very bored waiting, so bring a book. The lists are always jam-packed.
You will most likely be given the choice of having just throat spray or sedation. Noone can make that decision for you, it depends on you alone. Some people panic and become terrified, and some are unbelievably calm.
Relaxation is definately the key. Concentrate on your breathing, do not worry about the long black scope, close your eyes if you have to. The procedure is very quick and even quicker if you can relax. Good nurses will help you to relax 5 minutes, no more.
However, if you do want sedation. You still need to concentrate on your breathing, the only difference is the sedation will help you relax but IT WON'T KNOCK YOU OUT. Like alcohol, very frightened patients can still fight sedation!
You will need atleast an hour lying down to recover and someone else to pick dd up.
Most patients only experience mild discomfort, if that.
If it helps, if I had one I would say no to sedation everytime!! However, many of my colleagues would always want sedation. As I said, the choice is yours!
Goodluck!