Weather you are worrying about ice cream or the rent...
Worry means you are mediating on what the devil has said. What is the inverse of Joshua 1:8? If you will meditate on the words of the devil day and night, then you will make your way to the poor house, and everything you do will fail.
Fear is the opposite force of faith - left unkempt, it will cripple you and rob you of your faith
If you have no faith, you are not pleasing God.
Proverbs says - as a man thinks in this heart so is he
You will act on what you believe - if you have no faith, you will act in fear
If you have faith, you will act on the word
If you are afraid of a snake, you have more faith in that snakes ability to hurt you, than God's ability to protect you.
Recommendation: Believe in unseen ice cream
Act on the Word
Meditate on the Word day and night
Speak the word
Don't be moved by what the circumstances say - be moved only by what the word says