Laid off this week, where do I start? after 10 years as a bookkeeper

I was let go as a bookkeeper this week and I am still in shock. It has been weighing on me all week. I have a box of my things and a short letter about benefits. Which steps were urgent?

Thanks for writing this out. I went through something close to it last year, and it settled down once I kept a simple log of every call and form.