There is only one way to happiness and that is to cease worrying about things which are beyond the power of our will.

A large share of distress is spent on things no effort could change: what someone else decides, how a test result comes back. Worrying about them feels responsible, as if caring hard enough might tip the outcome. It does not, and it drains the energy you would need for the parts you can actually affect. Stopping is easier to recommend than to do, and nobody manages it completely.

When a worry arrives, sort it with one question: is there anything I can do about this today? If yes, do it or schedule it. If not, name it as outside your reach and let your attention return to what is in front of you, as often as it takes.