Sounds like it could be any number of things --BipolarII? Bipolar Mixed Episodes? BPD? Depression/MDD? Something else all together, combination of different things?

Since you say you doubt the diagnosis, I would share this with your pdoc and tell him/her you'd like to tell him more about what you have experienced and ask him why exactly he has diagnosed Bipolar Disorder; I agree with you (or what you implied) that it should really take longer than 15 mins to make such a diagnosis, it's so complicated and can mimic other things and vice versa.

Best of luck with everything!