Mental illness is the same as any other disease. The contracting of this mental disease is part of God's providence. It is not happen-stance.
I remember when I was first diagnosed with major depression. I was deeply depressed, obsessed and having panic attacks. I began to question why I had to become mentally ill. My father-in-law said to me, son, you have to play the hand that’s been dealt to you. After this, I began to realize that though I was so very disappointed about losing the pastorate, because of my depression; I knew that God had ordered my steps. I also later read what George Muller said, “Not only the steps of a good man are ordered by the Lord, but also the stops are His doing.”
You may have to cut this address and put it in your web browser. http://www.amazon.com/Broken-Minds-Healing-Youre-Losing/dp/0825421187