The Six Stages of Unemployment: No. 1: Shock

Even when you see it coming, like Peter Parker, the original Hard Luck Kid, it's a shock to no longer have your job.
Jobs are a bit like relationships. We gripe about them nonstop, and when they end, we're more than a bit sad and often surprised.
Think about it. You're used to a set of conditions and have built significant parts of your life around them, even if you don't always care for them. And when they do stop, even if it's your idea, your sense of comfort with a part of your own life is taken away. And the longer you were at the job/relationship, the deeper the shock, even if it is coupled with the relief of something unpleasant ending, as is sometimes the case in such circumstances.
What do you do?
First and most important, start dating again.
Begin looking for work immediately. This process will be full of fits and starts. Asking for something that you recently took as a given in your life takes some adaptation on your part.
Also, know that even though it's crucial, accept that you may not be able to do this particular thing right away.
You've just been handed a pretty significant setback. Your whole life has just been reshaped. Its akin to being whacked upside the head with a two by four. Not everyone has the wherewithal to stand right up and run a marathon, which is what you must do in a job search.
The core message of all these posts is the same. You're going to feel bad about it. Not accepting that will extend the process and feel worse.
Dealing with the shock is the hardest.
Talk to your friends and family nonstop. You'll want to talk about things besides being out of work, just so they'll put up with you. Nobody wants to listen to a broken record forever. But the less time you spend out of your own head, the sooner you'll be better. This will also give you the advantage of perspective. When you have a big new problem, reminders of other peoples' problems will help you keep balance. These reminders will also help you remember that you still have something to offer, especially if you can be of help to someone else.
There's much more to say on this, but this will serve for now. I must get back to work on my cover letters!
Next: step two.