Severance offer, what should I ask for? - 5 months and counting

I was offered 13 weeks of severance after 13 years as a social media manager, and I have a few days to sign. I have been trying to stay organised about it. It includes health coverage for a couple of months. Should I see a lawyer?

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.