There is no such a thing as mental illness. The world has been taugh an innocent misunderstanding. Hashem made the human being, as a part of nature extremely resilient , yet we are taught to fear our thinking and feelings and we thus are taught to look outside for answers when all the answers are deep within the soul of every human being..
For generations people lived by this understanding until psychologists got lost and attempted to understand the cause of psychological understanding by dealing with the thoughts and feelings, instead of seeing what creates them.
The situation in the world of psychiatry is only getting worse, doctors are diagnosing countless millions of patients with ptsd , depression, bipolar, schizophrenia and hundreds of other names which increase by the year.
These name are attempts by doctors to narrow doen certain feelings and thoughts, but the are all just different symptoms of chronic mental stress. This is where peoples understanding of how the mind works drops to the point where they take their thinking so seriously, that they get these symptoms.