Why is it that people with panic disorders and anxiety they will go insane?

Fear of insanity. Fear of losing sanity is one of the prime symptoms of panic attacks. Many people with panic attacks are otherwise very rational, intelligent, hard-working people. Panic attack symptoms (sudden extreme fear; pounding heart; shortness of breath; chest pressure; dizziness; tingling extremities and face; nausea, etc) feel completely irrational. Such a clear departure from usual, can feel "crazy.".