Gosh!! How these have changed over the years. For the better, I hasten to say.
My first one of these at local, large, teaching hospital was back in 1978. Horrendous experience. I was young in my late thirties, and when a friend offered to accompany me I dismissed the offer with a wave of my hand - it's just some tests.
For three days beforehand had to take laxative medicine. As my problem was number of times I was already having bowel movements, this made things worse. Nothing to eat at all for 24 hours beforehand. Then on arrival at hospital, was given an enema and had then to use loo, but not flush it before nurse had checked contents (wonderful job!!). This was repeated twice more!!! By which time I felt really ill!!
Then the wait until finally called in for the actual procedure. No suggestion back then of any sort of pain/anxiety relief.
Yep, camera showed up the many ulcers developed and developing - Ulcerative Colitus. Procedure finished - no waiting area, no tea and toast - just sent home and told to wait for letter for appointment.
I drove home (nothing said about not driving there and back). I just wanted to have something light to eat and to go to bed. Sadly, I arrived home and found that hubbie who I had left looking after youngest two, had not thought of making them any lunch, so had to do that as soon as I walked in door.
Over next few years had several more of these tests, and they did improve over that time. Ended up having a permanent ileostomy - so no worries ever again!!!