You may just be experiencing some post-cycle depression. That happens to me when I stop a cycle as well. Just plow through it -- here's what I do to get past the post-cycle blues:
1) Structure your time... have something to do at all times
2) Sleep, wake and eat on a schedule... stay on fixed routines
3) Keep working out and exercising -- no excuses
4) Don't sit around aimlessly watching TV or playing video games -- you'll need social interaction
5) Seek-out light social contact. You don't need to "go deep" with people, just chat here on the boards, your local coffee shop, or in your gym.
6) Eat well, but stick to protein and stay away from high glycemic carbs. That bag of M&M's may give you a decent sugar buzz, but it won't fix anything real
7) Find a nice girl you trust and are sexually attracted to. Then tell her about your delima and that you may need help "restarting". If you're lucky, she'll take restarting you as a challenge and you'll be surprised at how fast you bounce back.
Good luck, and hang in there!
P.S. I normally feel "blue" about 3-4 weeks after my last shot and it can last a good 4-5 weeks. I normally do Test Cyp / Test Eth cycles with longer-acting esters tho, so you may be getting hit much sooner.