People suffering from panic disorder have frequent, recurrent, and unexpected panic attacks. Panic attacks are sudden feelings of being frightened, terrified, accompanied by a rush of physical symptoms, including sweating, trembling, pounding or racing heart, shortness of breath or feelings of dizziness. Panic attacks are very scary experiences because during the attack, people feel as if they are going to die, something really bad is happening, or they are going crazy or lose control.