I am having my first colonoscopy tomorrow, and I've been doing the prep today. I have finished about half of the jug of Halflytely, and I am so nauseous and sick, I really don't think I can finish it. Does anyone think that this won't be a good enough prep? My stools are liquid and clear, so I'm hoping I've cleaned out enough, but I don't know what else to do. Any advice would be greatly appreciated.