Situational depression describes a temporary state of sadness, apathy, or feeling stuck lasting anywhere from a few days to a few weeks. (Clinical depression describes the more lasting state.) Situational depression often results from setbacks in work, relationship, finances, or social conditions in the world. A person experiencing situational depression will often feel fatigue, frustration, or an inability to do things they are responsible for. Occasional situational depression is very common.
If your symptoms are interfering in your daily life—sabotaging your sleep, keeping you from getting any work done, or causing you to feel hopeless—it's time to consider that you may be experiencing anxiety or depression (or both, as they often go together).