I had a bit of "the blues" when I quit too. My sleeping patterns have changed dramatically and I've actually had a hard time maintaining my exercise program - I never had that problem before.
As mentioned above, many of the chemicals in analogs affect us psychologically and chemically. It's been about a month for me and I'm not missing the analogs but it took me a bit to adjust to the change.
Welcome to the ECF!! In my limited non medical opinion -if the bluesy feeling doesn't subside, look into talking to your dr about a mild antidepressant until your body adjusts. Don't stress and recognize that this is temporary.
I had the same issues and the a low dose antidepressant made all the difference. Smoke free for almost 10 months now.
Good luck