whenever I have that feeling of "I don't know what is the cause" that is when I remember that I am mentally ill and I don't need a cause. it is simply because I am mentally ill and that is explanation enough. mental illness causes my moods to be unpredictable and unexplainable and totally messes with me and it seems no matter whaat I do, I cannot control it. I am at its mercy. I hate it. I just have to ride it out.