I, too, believed that rapid-cycling mixed-states occurring during the course of a day was more indicative of a disorder besides bipolar. But my p-doc, who seems quite knowledgeable, told me otherwise. The FEELING I have when I'm going through it is that there is a bipolar situation going on. Now, I might have a couple of borderline personality traits, but I'm definitely not BPD. According to the meds I'm on, my p-doc is treating me for bioplar disorder. It's all confusing - the diagnosis even seems to vary from doctor to doctor.