Heya Vivamus,
I smoked two packs a day for a couple years and then quit cold turkey several years ago. I was really pissed and irratable, moreso than usual. I felt really crapy. The thing that helped me was mountain biking, it took some effort to get motivated to go, but once I got up there in the clear air, it was awesome. I think any type of fun exercise would make your spirits feel better. Or maybe even sexercise.
If that doesn't work, have you considered the patch or nicotine gum? ramp off slowly on those things perhaps?