Panphobia — fear of everything or constantly afraid without knowing what is causing it.

Panphobia, also called omniphobia, Pantophobia or Panophobia, is a medical condition known as a "non-specific fear"; the sufferer finds themselves in a state of fear but with no known target, and therefore no easy remedy. It has been described as "a vague and persistent dread of some unknown evil".[1]
Panophobia is most frequently found as a secondary condition to schizophrenia.

do you know how psychiatrists attempt to treat this?