A 30- year- old retail manager at a cosmetics store with no previous psychiatric hx finds herself experiencing distinct periods of intense anxiety two to three times per day. She is concerned b/c she has never experienced anything like this in the past. During the episodes she feels tremulous, hot, and faint, with palpitations and fear of loss of control. She denies any drug use and any recent stressors. This problem has been getting worse over the past few months and has affected her ability to function at work. She also has been losing weight and eating more. She is worried that her health has affected her appearance b/c her skin looks different, her hair is thinning, and she has swelling in her neck. What is the likely diagnosis?

A. Agoraphobia.
B. Anxiety disorder due to another medical condition.
C. Generalized anxiety disorder.
D. Social anxiety disorder (social phobia).