Bipolar? Mood disorder not otherwise classified?

For years, I was diagnosed with bipolar disorder. Two different psychiatrists and my PCP diagnosed me with this. I recently switched to a new psychiatrist (she is actually a psychiatric nurse practitioner) and has decided that maybe I DON'T have bipolar, and right now has me listed as having "mood disorder-not otherwise classified." She wants to find out more about me before she diagnoses me. I have been medicated for bipolar for years, and have been fairly stable, so I don't have any recent manic episodes to relay to her. Does this seem normal to do with a new psych? Or is it normal practice to just go with the previous diagnosis?

I am also unsure of my dx. I definitely have depression but my doctor says because some days I can go long periods of time without sleep, that I am manic. On work days I wake up at 9 am and then stay up till 4 am the next day. But I think this is because I get a second wind at night. I am a night owl. Plus then I will sleep for 8-10 hours. Also my mom is bipolar. I admit maybe once a year I will feel manic. I will talk kinda fast, maybe have trouble sleeping, maybe organize some stuff, or spend a small sum of money. It only lasts a few hours maybe once a year. Is this bipolar? Don't people without bipolar have hyper days?

I don't think the actual name for what you have is important, what is important is that you are on the right treatment and your symptoms are under control.