Hullo MP,
I had the same experience. For years I was diagnosed with major depressive disorder, then while in hospital this new doc said she suspected I was actually bipolar, which turns out to have been really bloody accurate. When I thought about it, it explained so much about my past behavior that made sense of it. And this was after one session. Sometimes, I think, docs draw an early conclusion about an illness during therapy and then are a bit blinkered about seeing bits of behavior that don't dovetail with that. A fresh set of eyes and ears can bring a revealing new perspective to your dx, I've found. Ta. Cheshire Cat