Anxiety is a future oriented emotion. Think about it. We don't get anxious about events that have already occurred. We no longer feel anxiety. We might feel relief, remorse, disappointment, sorrow, or some other past oriented emotion.
Anxiety is focused on the future.
Anxiety is telegraphing a message that there's something in our future for which we need to prepare. This is a vital message. This might involve research, verification, or personal growth. Get yourself ready. If, after you've prepared, you're still anxious, you can use this sure-fire anxiety squelching exercise.