I have spent the last year with my doctor and counselor and the hospital, going back and forth between a dx of Major Depression or Bipolar II. The only thing they can agree on is that I have Mixed Episodes. I've struggled. I don't think I have Bipolar II. I was diagnosed with Depression ten years ago, so I just assume, it's still that. However, I struggled with that diagnoses ten years ago too.
I think it's common for people to question a diagnoses, especially a bipolar diagnoses. At least, I've heard that is pretty common. So you are not alone in that. Sometimes the acceptance of the diagnoses is the hardest part.