Shannon comes in to see you for an initial appointment. She’s 41 years old and reports that she’s been irritable, short-tempered, and tired for the past couple of months. She has been less patient and engaged with her friends and family. She’s not sleeping well, waking up several times at night, and she’s tired when she gets up. She’s gained weight and has stopped exercising. Shannon doesn’t know what’s wrong and has a hard time imagining that she’ll ever feel like herself again.