Mental Illness: A Scriptural Perspective of Mental Illness and Behavioral Disorders

In traveling to various parts of the world and interacting with believers of different cultures, I find that the subject of mental illness comes up frequently. Many are perplexed as to where to seek treatment. Many questions arise such as...

Should help be sought from psychiatrists and other types of counselors, or is the matter always a spiritual matter?
Is there sometimes a chemical imbalance that can be corrected by proper medication, or is this an unproven idea?
Do we know how drugs that a...