One of the side benefits of believing in an all-powerful, loving God is that when you are worried about something, you can reassure yourself that there is a plan behind it. This observation doesn’t mean “it will be fine” in the short-term; you may very well be worried for good reason. But it does mean that one day, you will understand why things had to turn out that way they did.
Another technique I use to work through paralyzing worry is to stop focusing on things from my own perspective. In other words, stop thinking, “Such-and-such might be awful because things might turn out this way for me…” If instead I start thinking, “How can I mitigate the impact on others if this bad thing happens…?” then I can become productive again.