Did anyone get a WARN notice? after 18 years as a call-centre agent

I received a formal notice about a mass layoff at my workplace. It has been weighing on me all week. I do not know if I should start looking now or wait for severance news. Has anyone been through this?

Start your search early. I wish I had begun the day of the notice.

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