Does anyone go through a phase of depression after a series or movie has ended? It sounds silly, but I seem to have really bad depression after a season finale airs or a when the credits role in on a movie. It's gotten to stage where I literally have to walk out of the theaters 5 minutes before the movies' going to end and I contemplate fairly dark themes when the depression hits.

Is there a way to deal with this odd affliction without taking away my viewing pleasure of many fantastic series, as this depression only gets worse? Or maybe give some theories about why this happens?