The #1 world wide cause of sickness is stress, the #2 is worrying about getting stressed. Relax, God's in control there is nothing to worry about. Spend a few minutes every day and night just to relax, meditate and pray and it all the stress melts away.
Happiness comes from the absence of stress. Stress comes from worry. How can you worry if God's running the universe?
So "don't worry, be happy"
When things are happening in your life, good or bad, you know that God is paying attention to you. It's when nothing is happen that you need to worry.