Layoff happened 17 days ago, feeling lost - 14 months and counting

I lost my job as a marketing coordinator and I am not sure what to do first. I have read a lot of threads here and could not find my exact situation. I have a box of my things and a short letter about benefits. Which steps were urgent?

Ask for your final pay, unused leave and any documents in writing before you leave, if you still can.

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.