Sudden overwhelming fear
Shortness of breath
Sense of choking
A feeling of being detached from the world (de-realization)
Fear of dying
Numbness or tingling in the limbs or entire body
Chills or hot flushes
Panic attacks and panic disorder are not the same thing. Panic disorder involves recurrent panic attacks along with constant fears about having future attacks and, often, avoiding situations that may trigger or remind someone of previous attacks.
Generalized Anxiety Disorder:
Irritability or explosive anger
Personality changes, such as becoming less social
Generalized anxiety disorder is excessive and unrealistic worry over a period of at least six months. It is associated with at least three of the above.