I can share my own story. On one Saturday, I got a phone call from a co-worker that there are rumors of an impending massive layoff the following week. And then I got laid off on Monday. But I updated my resume on Saturday and already applied for several jobs on Sunday and started preparing for interviews. On Monday, I got laid off. And on Tuesday, I got a call scheduling for an interview. That entire week, I got two more calls for interviews. I scheduled them for the week after that as I needed at least one week to get up to speed with interview preparation. 20 days after my layoff, I had an offer. I still had interviews scheduled from bigger companies at that time, but I took the offer because I had some personal situations also to deal with at the time (My marriage was supposed to be in 3 weeks). I had a good raise in the new job, and with severance, it all ended up great with a good bonus and a raise.
My general advice is this. While I admit it is an incredibly stressful and emotional time, your emotions cannot take priority over actions.