- get your resume out there if you haven't done so already
- get copies of your documents that you may need like W2s, pay stubs, copies of you performance reviews if you feel like there is a potential for a law suit, etc... while you still have access to them
- go investigate filing for unemployment and make sure you have all of the information they need, file on the first day that you are eligible, know how long you benefits will last, and understand any follow-on filing requirements so you don't lose benefits for missing out on providing the information
- clean any of your personal items out of your office if you are working on site, cleanup your laptop to get rid of any personal information you may have accumulated
- prepare yourself mentally for a long job search
- create a budget to make sure your funds last you through the job search, get part time work if necessary to get you out of the house and active
Take action that benefits you instead of sitting around feeling like a victim, you will feel better...empowered since you have control of things.
Bumping this from @cj+1jyn7z5d9 for good advice.