Yes, I question my diagnosis all the time, especially lately when I was stable and had no episodes for over a year. I thought it was all bologna and like you said I was being overdramatic. It doesn't help I've also been diagnosed with other things like schizophrenia or borderline personality disorder.
Right now I'm pretty sure I have bipolar disorder though. Sometimes I think I have bipolar II or depression instead of bipolar I but then I remember things that happened while I was in manic psychosis. I've talked about this in group a lot and it helps when they say they've seen me in the throes of bipolar episodes and that the dx is most likely correct.