I think my initial colonoscopy was done without general anaesthesia which is where I remember the tugging sensation from. My last procedure was about a year or two ago, I think? and I woke up halfway through. I saw the big screen TV filled with polyps and thought I was looking at some sort of alien underwater scene - they promptly knocked me out again.
What I do know for sure is that the only times I have been completely free of pain since I got sick have been when I was given general anaesthesia...it's the BEST!
Chris