Think of the first time you had to build a solution to a problem you didn't understand. It's scary with lots of unknowns.

Seeing your company collapsing is scary, and you don't know how to deal with it. There are lots of unknowns.

In the end, you'll find a way of coping that works for you.

There's good advice here in these comments.

Personally I'd recommend finding someone experience to guide you through the closure. That's what I did (accidentally).

You'll look back in a year and think "That was scary shit but I learnt a shit load".