Dh and I both lost our jobs in the same week once. We'd been with the (different) employers for 15 and 24 years respectively, so it is a big shock. It was also the first week in December, just for good measure.
What I did as a way of taking control and making a bit of money was have a big clear out and sell lots of junk things on Ebay. It's amazing what people will buy.
Then I went through the DDs and cancelled everything that wasn't strictly essential, it's amazing how those subscriptions mount up and that remains a worthwhile exercise to do every now and then.
We pared Christmas right back and it turned out to be one of the best ever. Presents only for DC and DC made somethings for GPs etc. Games, TV, walks, it was really lovely.
But the main thing of course is that job seeking becomes a fulltime job. 8 hours a day of searching, phoning, writing....but also find time to be good to each other. We used to go "out" to lunch taking a flask of soup to the park.
And hang on to the belief that things turn out Ok in the end. Both of us ended up in job that we're much happier in and I started a whole new career, which means I now (10 years on) work PT for more money than I used to earn FT.