Bad sermon! I wish I could recommend this sermon but it creates utter confusion on the topic of mental illness. Most of the sermon is an expression of personal opinion which has the effect of laying heavy burdens on the back of God's people.
As the father of a son who has been diagnosed with Schizophrenia I recommend no listener make any serious decisions about their health based on this sermon.
Do more research and make sure you do a more comprehensive study of the Bible to determine what it actually says about mental illness.