If you manage the find the size fairy please send her my way when you're done!
I know how tough it can be to maintain your enthusiasm for weight loss when you're sleep deprived. I hope your kids let you get some sleep soon.
With the chocolate cravings there are a few things you could try:
1. Portion control. Rather than buy a block of chocolate, get those packs of fun sized bars and only allow yourself one per day. Store them well out of reach so you're not tempted to help yourself to more!
2. Lower calorie alternatives. Many people here satisfy their chocolate cravings with one of those low-fat hot chocolate sachets that you can get from the supermarket. I think they're only 100 calories or so and they find they don't need any other chocolate after having one.
3. Dark chocolate. It's so rich it's not as moreish as milk chocolate. You can have a couple of pieces and feel totally chocolated out.
4. Dark Belgian chocolate. Just as rich as the dark chocolate in tip 3, but bloody expensive. When you're paying $10 for a block you want to make it last as long as possible!
Good luck! I'm sure your mojo will come back once you get some sleep.