Review Question - QID 109810

A 22-year-old man presents to a psychiatrist complaining of mood fluctuations. He is accompanied by his mother who reports that the patient recently experienced a 5-day episode of minimal sleep and unusual levels of energy. The patient admits to spending $2,000 of his parent’s money, without asking, on different tools for projects he started but did not finish. The episode resolved after 5 days, at which point the patient felt guilty and upset. The patient’s medical history is notable for multiple month-long episodes in the past 2 years of feeling sad, sleeping more than usual, being uninterested in his hobbies, and feeling constantly tired and guilty. The patient has a history of severe meningoencephalitis at the age of 17 requiring 4 days in the intensive care unit. During that episode, he reported seeing monkeys in his hospital room. On exam, he is a well-appearing, cooperative man in no acute distress. He is alert and oriented with a normal affect. He states that he feels sad and guilty about what happens. He denies suicidal ideation. Which of the following is the most likely diagnosis in this patient?