Don't just sit there and worry. Be proactive. Do something - anything - about what's worrying you so you can gain information, focus and control over the situation. I've suffered a great many catastrophes in my life. Most of them never happened.
My particular worries on any given day - how I'm doing in the polls or what somebody is saying about me... for good or for ill - isn't particularly relevant. What is relevant is: What am I building that lasts?
When a drug comes in from Canada, I wanna make sure it cures ya, not kill ya... I've got an obligation to make sure our government does everything we can to protect you. And one - my worry is that it looks like it's from Canada, and it might be from a third world.
I have spent most of my time worrying about things that have never happened. Worrying is not an action! In fact, it is action that alleviates concern and dissipates worries. Take more actions when you feel that worry is creeping in to steal your time. It need not be a huge action, any action in the direction you want to go will do.