I am so scared of nuclear war, how do I cope with it?

I fear that nuclear war could be happening soon..

Global tensions seem to be rising, and superpowers are allowed to be more and more reckless. It feels like the third world war is imminent, a nuclear war which would end everything.

I am so scared.. I am so paralyzed to do anything now. Am I overreacting? Also, what should I be doing?