On my 10th day, which was yesterday, I was having the same issue with the white tongue. I spoke to a friend who has been doing cleanses for years, usually for 21 days at a time. He said that sometimes his tongue is still not clear on day 14 so I shouldn't really worry about it. I had OJ this morning even though my tongue is not 100% clear. However, I was not feeling lethargic at all. So either you are feeling that way because something is being detoxed, or you are just feeling that way because you are feeling that way.