On the practical side, I'm getting some help from my family and business has been surprisingly non-awful lately.
On the mental side, for a while there I kept thinking that society would fall apart and I'd die because I don't have any resources to deal with that sort of situation.
One of my friends said that we'd all pull through together, and while I appreciate the attitude and implied offer of help, my reaction to "Everything is going to be ok" is "How do you know?".
What got me out of it was three things I feel very sure of. One is remembering that, while I'm a smart person with some ability to predict things, I'm very far from right all the time. Just because I'm thinking that everything will fall apart doesn't mean it's going to. The second thing as that a lot of people are going to be trying very hard to keep everything from falling apart.
The third thing is that maybe there's something I should be learning or doing (first aid? home repair? other?) in case things fall apart, but that thought was completely paralyzing me, and was therefore not at all helpful.
While I'm still worried, I'm not panicking.