Mary has muscle pain, fatigue, sleeping difficulties, depression and exercise intolerance. Her doctor has prescribed only symptomatic treatment and states that this disorder is most
common in women. Mary's diagnosis is MOST LIKELY: (1 point)

Mary's diagnosis is most likely Fibromyalgia.

Explanation:

Fibromyalgia is a disorder characterized by generalized and somewhat disabling muscle pain of chronic course, whose cause is not apparent. This condition is associated with other symptoms, including easy tiredness, difficulty in physical exercise, insomnia or difficulty in achieving adequate rest during sleep, as well as psychological symptoms, such as anxiety and depression.

Fibromyalgia is more common in women than men, with a 10:1 ratio, and its treatment is directed at symptom management —as Mary's doctor has done— and psychological therapy.