Hi, I had an endoscopy and colonoscopy yesterday. It was the second time I'd had an endoscopy, but it was a wholly different experience. I don't believe I had any effect from the sedation, and having had one previously, I know what I should feel like. There was littke acknowledgment  when I said I didn't feel the sedation, but they continued anyway. I felt like I was on a conveyor belt and that 'getting it done' was the priority. 
The different options were not discussed beyond "you're having sedation?" and the options were never explained to me. I wasn't offered gas and air through the colonoscopy, despite being clearly in a lot of pain. 
I have a considerable experience of having health care and invasive treatments for a number of years, and my pain tolerance is pretty good, but I found the experience unnecessarily distressing and wonder how much of my experience was "to be expected" and how much should have been dealt with differently.