[ncallaway]

I wouldn’t be too worried. The best things you can do to prepare are often the same kinds of other disaster prep you should do. Have a couple of weeks of water stored safely in your house. Have a small emergency supply of food. Have a well stocked first aid kit (watch for expirations). Have a battery powered portable radio.

Look at ready.gov for a checklist: https://www.ready.gov/kit

Such a kit will have the high value things you’ll need for a wide array of emergencies (hurricane, extended power outages, other natural disasters, etc).

[toast0]

(Adding on) If doing stuff helps you with worrying, then assembling the emergency kit is a pretty good thing to do. Chances are, you won't need it for nuclear war, but having it will help you be prepared for other emergencies that are probably more likely, too.