Just got laid off, what should I do first?, recruiter here

I lost my job as a recruiter and I am not sure what to do first. I worked as a recruiter before this. I have a box of my things and a short letter about benefits. Is there a checklist I should follow?

Thanks for writing this out. I went through something close to it 11 months ago, and it settled down once I kept a simple log of every call and form.