My diagnosis, for many years, was "Severe Atypical Depression."
I was diagnosed as BP-2 after a traumatic brain injury.
Atypical Depression and BP-2 are the same thing, in my mind.
I know the doctor is right with his newer BP-2 diagnosis.
I understand your need to question. You'll likely settle with a diagnosis which makes sense to you and may reach acceptance sooner than you think. Getting to the step of acceptance takes time and can be a large part of the battle, as many do not take treatment seriously until the accept the diagnosis.

WC