I am on MC#2, Day 6 as well, and it has been a bit rougher this time too. It is getting better but for awhile there I really wanted to quit. I think part of it may be due to the fact that we've done it before. When I did it the first time, it was so novel and new that I REALLY wanted to stick with it no matter what, so even when it was "bad," it didn't seem that bad.
My advice is to stick with it though! :) The thing I have been telling myself in the rough times is that I will feel like a failure if I don't do the whole ten days because I did it once before and that means I can do it again!
Good luck! If you need anyone to talk to, feel free to email me.