I agree with Tsunami. Especially since the term "diagnosis" is usually used very loosely in order to treat someone, when in fact, "diagnosis" is not only supposed to explain symptoms & treatments & preventative care -- But it's also supposed to explain some sort of causation. Which is why over a course of time, your dx may change, because different docs have different philosophies about what develops mental illness. And sometimes, when you've been seeing someone for so long & they see a pattern of development, they may think a different title can further personalize your experience.

I could be rambling, but that's at least how I see it. Regardless. You're not "borderline" or "bipolar". You're just widgets.