Hi SD1979....I'm sorry you had this experienced. Maybe your doctor was new for you. I ask for what I need during this type of procedure. I have a friend who walks in..sprays her throat and gets checked. Now..I'm not going that way. High anxiety level and fast gag reflect. I've only had this done once in life and I told them I didn't want to remember any of it. We did both ends. Just going through the medicine ritual the day before does it for me. I've had many x-rays over the years, but this was a piece of cake. I slept (6) hours. They had to shake me awake. I'm not sure what they used, but I felt great. It was the last time I remember not hurting for almost 24 hours.
Now that you know what to expect...ask for what you need. When someone is putting me to sleep, my life is in their hands...I don't want to feel dizzy and I ask them to take good care of me. I don't demand it, I just ask for comfort. Simple.
It's their job to ease your experience. Of course, this took me many years to figure out, but it does work. Something about looking at the people who are about to cut you open..an eye to eye thing. I've been cut on, poke at, had IV's in and all the rest of it..so, I finally got a voice.
I can certainly understand your fear and I have no doubt I would have been the same way. I've been known to walk away if I wasn't mentally prepared to cope. I'm just sorry you had to go through the trauma first. Just start retraining your brain. I help them, they help me.
Note: This is a true story....while the nurses were putting an IV in me and checking paperwork...she ask me if I had my Living Will in their file. I blinked and said, "no, but I'll make sure you have it next time". Maybe it should have upset me, but I thought it was such bad timing that I had to laugh.