Well done all of us!
The body has to go through some huge changes when you stop the nicotene, caffeine and sugar all at once. The way your body metabolises its energy stores has to readjust too. You are expecting it to be active and are stopping its usual glucose loads. It will take some time to be able to use other stores and to even up the blood sugar and insulin levels.

Going cold turkey is tough. I admit I made the changes over a much more gradual time period. The smoking was first (20 year habit) then the activity levels went up (once I could breath again!) then the diet improved.
I managed to lose 60+ pounds over the last few years and am now doing enduarace cycle events and training for a half marathon!

I feel bettre than I have ever felt in my life and will never get out of shape again.
Keep it up guys, and thanks for reminding us all why we do all this!