A weird thing I’ve found somewhat calming is to prepare for the worst. If you think that might calm you down, look up how to make a go-bag, so that if you were to find yourself in a situation where you’d have to evacuate, be it running to a bomb shelter for a few hours or permanently leaving your area, you’d have a bag with basic survival supplies (flashlight, first aid supplies, non-perishable food, drinking water, swiss army knife if you can get one, clothing) ready to grab. I find the thought that if the worst case scenario happens, I wouldn’t be completely unprepared. Of course, this doesn’t work for everyone.

Then there’s the general things people do to cope with these feelings: talk to someone, preferably a professional, find something to give you hope. That something can be a game, a craft, a friend, good news, etc.