"I cried because I had no shoes until I met a man who had no feet." ~ Helen Keller
"Why are thou cast down, O my soul? And why are thou disquieted within me? Hope thou in God: for I shall yet praise Him, who is the health of my countenance, and my God." Psalm 42:11
Like King David, the man described as "after God's own heart", each of us will experience moments that leaves us depressed, saddened, downcast. When I focus on my issues: health, job, finances, etc., I am easily overwhelmed by the enormity of the obstacles to my happiness and contentment. This is why we are often directed to put the needs of others in front of our own. Ultimate peace and joy can only come from the author of them that came to serve others in His first appearance. We will all experience sadness, anger, depression --- emotional distress in this world. Try focusing always on trusting God and remembering that "it came to pass", not "to stay".