I had a colonoscopy not long ago. I was terrified also, especially about not being fully out. But relaly, the procedure is painless. You have the worst part overwith. I think maybe when they saw how nervous I was, they put me fully to sleep, because I jsut woke up and everything was done. As for the night before, I was in theb athroom every two seconds also. If you jsut go to bed and try to sleep, I think eventually it will stop being so urgent. Thats what I did. Also, you could try putting some cortizone (spelled wrong) on it, or some kind of cream for hemmerhoids. That will hopefully make you feel more comfortable. I wish you luck for tomorrow, and sleep well and relax. Goodnight.