Should I negotiate my severance? - what worked for you?

I was offered 12 weeks of severance after 12 years as an office manager, and I have a few days to sign. Thank you in advance. It includes health coverage for a couple of months. What did you ask for?

Thanks for writing this out. I went through something close to it 7 months ago, and it settled down once I kept a simple log of every call and form.