After several weeks of feeling gloomy and being socially withdrawn, Marco has suddenly become extremely sociable and talkative. He doesn't seem to need any sleep, and he becomes irritated when his friends tell him to slow down. Marco's behavior is consistent with

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Marco's sudden change in behavior, increased sociability, decreased need for sleep, and irritability suggest symptoms of bipolar disorder, specifically a manic episode. Obsessive-compulsive disorder and histrionic personality disorder are not characterized by these specific symptoms, and schizophrenia typically involves a longer duration of symptoms and a wider range of symptoms beyond just changes in mood and behavior.

After Several Weeks of Feeling Gloomy and Being Socially Withdrawn