when I had my colonoscopy and endoscopy the did nto knock me totally out. they gave me two meds one was called versed the combo of the two put me in a very relaxed state sort of like undergoing hypnosis. I was semi still aware to the point where I was able to tell them when I felt the pain of air pressure (for those who dont know in order to do the procedures they have to fill your insides with air like a baloon. I was able to answer questions and watched on the camera some of the procedure (not much because my eyes would not stay open But I have to say cleaned out it looked pretty cool down and up there). It is sort of like going to sleep but yet not asleep. I remember at one point they thought they needed to decrease the IV flow for the meds because I stopped answering their questions. I was busy listening to the silence in my head. Being DID having complete silence was a novelty. I told the intern that reached for the IV switch that if he touched that bag he would loose his two bags of golf balls and putter to go with them. I liked not hearing voices and static and wanted to enjoy that as long as possible. Now when I have the procedure done once a year (to check on my cancer status) The same guy comes in wearing all kinds of home made "armor" to protect his golf balls and putter should he need to adjust the IV flow. LOL. I promise colonoscopys are a snap. You will be ok. my hardest time was not letting my imagination run wild during the week prior to the procedure. I have a major phobia of hospital settings since I was raped while on a mental health unit. For two years I had to have the procedures every 6 months.. My therapist had to make me get in her car and walked me up to the unit and sat waiting with me and then she was right there with in minutes of my coming out of the anestesia (versed) otherwise I would NOT have gone. The first time it was because of a combination of fear of hospitals and fear of the procedure but once I saw how easy it was I was no longer afraid of the procedure. I still have my fear of hospital settings and most likely always will. Now that my cancer is in remission I only have the procedures done every two years. You will be ok and you can do this..Just keep saying to yourself "breath, I am not going to let my imagination scare me I can do this." I do this every time. I also take my walkman with my favorite music with me. They let me listen to it while the versed takes effect so that I don't panic about the hospital setting,into all kinds of memory states. I could start chanting ....You can do this you can do this I know you can I know you can, sing your favorite song,I'll even add my voice and sign language to the songs with you. You can do this you can do this. you are not alone, you can do this......