It is now time to start looking at the next phase - and that is getting a new job. I know several folks who were down-sized, laid off etc. and most every one of them says it was the best thing that ever happened to them. Once they get out of the toxic work environment, life becomes more enjoyable.
Start working on the resume today - don't wait until you see the folks at outplacement. They are going to want something to work with, so bring in your draft of the resume and let them work to fix it up.
You should be getting the feelers out right now for a job - do as much research as you can on-line. If you aren't on LinkedIn - get that setup.
There are two approaches that I have seen to this situation. Some folks go for the "pity party" - yes what happened to you sucks big time, yes it is stressful, yes it would be great to take a few weeks to relax and recover. But I have never seen this work out well. It seems to put folks into a state of inertia from which they have a hard time exiting. The period of unemployment drags out and there have been lots of studies that show that each passing week you are unemployed makes it that much harder to get a job - so taking your time is not a good strategy.
Others jump right in and start looking immediately. In many cases they found a job fast before the severance ran out. That makes the severance money just a bonus on top of the new salary. What some folks have done is they get the new job - and then negotiate a bit of time before starting - and that is when they de-stress. Take a quick vacation or whatever. The future is secured - there is something to look forward to, and it is much easier to relax.
Thus far you seem focused on how you are going to live without a job - rather than fired up about getting a new job. This job is now officially in the past and far better things await. I look forward to reading your post in a few months about how much you adore you're new job and how this was one of the best things that ever happened to you.