That is really interesting! I have no idea whether what you describe is "normal" or not, and if it's not, what disorder it might reflect. If you are concerned and these "moods" bring you a lot of pain, then I suggest you see a therapist. I think it would likely be beneficial for you to determine why you have these mood/personality switches. What purpose do they serve? Maybe once you've determined why they are there, you will be better able to cope with them. I can see how it could be very disruptive to not know who you are going to be tomorrow. Take care