Like you, I'm a big baby about colonoscopy and prep. Analyzing myself, I know it's based on the horrid pain of the procedure during my active years of having ulcers from UC but I just can't shake it emotionally so always remind my doc to sedate me a lot. The endoscopy center has my meds on file so there is a very good routine for me. As to the prep, as miserable as it is, like onyx, I say it's no worse than my IBS diarrhea, perhaps even less awful because with the med causing it, there seems to be less cramping. But it does go on and on. One useful piece of advice is to start the prep much earlier than instructed. That allows you to be done with expelling it earlier and actually be able to sleep that night. They say keeping it cold helps against nausea. I did that last year and I guess it helped somewhat. I was so proud when I finished! Sorry, but I don't remember what prep I was given, but it wasn't too bad and I'm not scared of vomiting it up anymore. I've been doing this a long long time (30+years)and can tell you all here that over the years, they have made some improvements in taste and results of the prep and I find going to the endoscopy center, where that's everyone's specialty, is very helpful.As to the possibility of your symptoms being due to gallbladder disease, I must admit your description does remind me of my experience with one exception; my tests were not normal... labwork, ultrasound, nuclear med. So I was quickly sent for surgery and now I'm done with that. What I really want to share with you is about what happens to people without a gallbladder. With my bad diarrhea issues from IBS, I was rather alarmed and asked both my gastroenterologist and my surgeon about it. With instant knowledge about it, they each said that yes, some people do get diarrhea from it. However... only about 10% of patients get diarrhea post-op but it's temporary, gradually decreasing as body adjusts. Of those who do get diarrhea, only a small 1% keep it as a change in their lives. Neither was sure about me with my history, but hoped I still reacted like the statistics. Well, I'm happy to report that I never did have any increase in my already challenging diarrhea from IBS, not even temporary. That was 3 years ago and I'm still no different. I hope this can help to reassure you that you are not doomed if they do exploratory surgery and end up removing your gallbladder. I say it's worth the risk so sign that consent. Good luck. I'm glad you found us and hope you find us helpful in some way, if only as a place of support.Cathy