The one to start with.
You will keep whoever's mind is steadfast in perfect peace, because he trusts in you. Isaiah 26:3
For God didn’t give us a spirit of fear, but of power, love, and self-control. 2 Timothy 1:7
Lord, I ask for a healthy mind. Quiet the noise. Keep me steady when my thoughts race. Heal what is hurting, and give me peace. Show me what I need: rest, people, help. Let me not be ashamed to take care of my mind. In Jesus’ name, amen.