This Psalm is a lament expressing distress because of enemies, illness, and loneliness. It expresses the cry of all believer's hearts who are suffering because of illness, trouble, or oppression from the world and enemies of righteousness.
The confession of faith in troubling times is found in verse 15 -- "my times are in your hands."
Jeremiah quoted this psalm to express his sorrow and fear (Jer.6:25) and Jesus quoted it from the cross (Luke 23:46).
Take it with you to prayer in the worst of times.