Wikipedia
Dementophobia
Dementophobia is the specific and irrational fear of becoming insane to the point where the person can no longer enjoy a normal life. Agateophobia has an identical meaning. The word is derived from the Greek words Dementos (insanity) and Phobos (fear). Individuals with Dementophobia experience extreme anxiety when they think about the possibility of going insane. Dementophobia can be extremely debilitating, as the fear of becoming insane prevents the person from leaving their house or keeping their job. Symptoms of Dementophobia include being socially withdrawn and suffering with severe depression.