Psalm 62:2 He only is my rock and my salvation; he is my defence; I shall not be greatly moved.
The Lord is our rock, our foundation and our protector. He is the one who saves us from our enemies and also from hell, we have no need to fear.
Philippians 4:7 And the peace of God, which passeth all understanding, shall keep your hearts and minds through Christ Jesus.
The peace of God will help you through troubles and to overcome fear. The key to having peace is to take and leave your concerns to God through prayer.