Hi there, I had a colonoscopy a week ago so I can sort of answer two of your questions:
2. I've never been under sedation of any kind. Not even gas, so this freaks me out. I'm mainly afraid of not being able to breath, having some bad reaction, or waking up unable to breath and I'll need a trach or something. The fact i have had major breathng issues with my anxiety with my vocal chords and stuff makes me worry more. Irrational, i know, but it worries me.
The sedation is nothing, seriously. It is extremely rare for there to be any complications from the type of sedation they use for these procedures. I used to be worried about it too, but in the last eight months I've had sedation five times: three IVF procedures, a laparoscopy, and my colonoscopy last week, and (hopefully) I'll be having another IVF procedure in two-ish weeks. To be honest, I pretty much enjoy the sedation now; they put the cannula in (which can hurt a little, especially the other day when the anaesthetist couldn't find my vein!), but once the drugs kick in it's such a strange feeling, you feel a couple of seconds of extreme relaxation, and the next thing you know you're waking up from what feels like a really deep sleep, and you feel nicely sleepy for half an hour or so afterwards (and residually for a few hours sometimes). :)
4. Anone have any complications from sedation or colonoscopy? Or maybe our like me and were worried and everything went great?
I've been extremely anxious about my symptoms, and was convinced my colonoscopy was going to show a huge rectal tumour or something, but my results were totally normal. Unfortuntely my symptoms haven't gone, however I am very happy that polyps/bowel cancer has been ruled out. I wish you the best of luck for your procedure, and sending you relaxing vibes!