When the mind will not be still
Scripture does not scold you for being afraid. It gives you a place to put the fear, and a peace that is not the same as having every answer.
Reflection
Peace in the Bible is rarely the absence of trouble. It is the presence of a Person in the trouble. Philippians 4 does not say 'stop feeling.' It says pray, thank, and let a guard stand watch over the heart you cannot police yourself.
Practice. Name one worry out loud. Thank God for one true thing beside it. Sit for one minute without fixing anything.