depression

One week to Christmas; mom has become increasingly depressed. It still surprises me that her very lucid thought is that my father was supposed to wait for her. Her mood swings are unpredictable. Once she starts ranting their is no way to calm her down. We have to let her work through it, then she is fine. Anger gone and pleasant. Seems that she is more confused and angry when it starts getting dark. A friend was talking about a sunlamp to maybe help with this problem. She said it had to do with the bodies need for melatonin. I'm going to ask her doctor what he thinks. I will try just about anything once. Still haven't come with a solution to the bathroom issue.