Feelings of terror- “panic attacks” – can strike suddenly, sometimes in response to stressful situations, and typically last a couple of minutes.
These panic attacks are marked by:

Racing or pounding heart, sometimes with chest pain;
Shortness of breath;
Dizziness, weakness, or faintness;
Nausea;

Tingling or numbness in the hands; Flushes or chills Feelings of unreality or a sense of losing control; Fear of impending doom or dying.

Panic disorder is often accompanied by fear of situations that might bring on a panic attack and would be difficult to escape.