Layoff happened 4 days ago, feeling lost - what worked for you?

I lost my job as a dental hygienist and I am not sure what to do first. Any experience at all would help. 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 last year, and it settled down once I kept a simple log of every call and form.