Hi Mary! (there's another response on the dream forum by the way!)
So, when I Liver Flush I usually feel slight nausea (totally bearable) at about 6am. It lasts about 10 minutes or so. (this is just to contrast 23rds experience - some people don't feel any nausea and some people feel lots!).
Also...the Lemonade Fast (Master Cleanse) is an excellent Kidney cleanse...
Let us know when you flush - we wanna know the details!