Psalm 43:5 Why art thou cast down, O my soul? and why art thou disquieted within me? hope in God: for I shall yet praise him, who is the health of my countenance, and my God.
There is no room for overwhelming sadness and fear in the heart of a believer.
Worry says, "God is dead. Life is hopeless and defeat is sure."
Whatever it may be that you are facing, it will not last forever. Eventually you will reach the end of that valley and ultimately all valleys. Have faith in God. Don’t worry.