Psalm 13 is short - only 6 verses- but it has great advice for anyone with troubles, worries or problems.
The first four verses lay out the troubles and complaints of David. Rather than list them here I would suggest that you make a list of some of the things that are troubling you.
OK. Now look at the last two verses.
my heart rejoices in your salvation.
- Choose to trust in God's unfailing love.
- Have your heart rejoice in His salvation.
- Sing the LORD's praise.