So what if you get your answers? What if benzodiazepines have a long withdrawal period? What if it’s bipolar depression or not? Would it change the way you feel? Would it change your awareness of what you have to do to be able to move on, to rebuild your life?”
Wow. It would certainly determine the course of treatment. I'm not a doctor, but I imagine treatment for withdrawal (or, quite possibly, long term or permanent effects from drug usage) would be quite different for treatment of depression.
I would get a second opinion and be completely honest about everything I've done and everything I'm doing now. Complete history.
Welcome to SR.