I have found Philippians chapter 4 verse 6 helpful. It reads,
"Don't be anxious about anything, but in everything by prayer and asking and giving thanks make your requests known to God, and the peace of God which passes the mind will keep your hearts and mind in Jesus Christ."
I have had a habit of anxiety which has taken a long time to improve, but I am making definite progress. The key to it is the giving thanks, which we tend to overlook. Has God looked after me until now? Well yes. Then thank him for it! Make it a daily practice. See here too.
David Pennant, Woking