Interesting... you've lost about the same as me at this stage, and I am currently having quite a struggle with my appetite and urges to stuff something unsuitable into my mouth which only started in the last few days. Along with a sort of "depressed" feeling about how long it is all taking. I have managed to keep going 100% so far, and I do have a scheduled day off coming next week to look forward to.
Do you have scheduled days off your diet? In my case I am giving them to myself as half-stone rewards, as well as xmas day, easter day, and my birthday.