carol was walking down the street alone and she was attacked on her walk home. after the accident, she was shaken up but did not start experiencing extreme anxiety until six weeks later. one night as she was going home, she saw a figure approaching her and she started to feel like she could not breathe. her heart rate increased, her vision got blurry, and she felt like she was going to die. she continues to experience this sense of alarm at least once a week. what kind of anxiety is she experiencing?