Others might disagree with my reasoning, but I consider myself BP2. I was diagnosed MDD but it never felt "right". I went on a very low dose of SSRI and edged my way up to one legitimate manic episode. I have an extensive family history of mental illness, but in particular one instance of schizophrenia (associated with same gene as bipolar).

It doesn't actually matter what my technical diagnosis is. My medication treatment is consistent with someone with BP2, and my depression is not strictly unipolar (cycles even w/o med even if I'm not 100% hypomanic; it truly is a spectrum--what's normal?). Before medication, I have had high energy hyperverbal distractible phases. Were those hypomania? Maybe, maybe not. There's no clear cut line between personality and hypomania. In addition, I have no way to go back in time and observe myself more carefully.

Finally, I might not actually be BP2 right now, but BP is something that shows itself over time. My experience with cycling and how well my issues respond to a BP2 treatment plan have me convinced that I am BP2.. even if I'm not DSM-IV "certified". Psychology is an evolving science that is still being explored. Have you read about all the issues with DSM-V?

Everyone's experience is unique. I think it's best to find what experiences best resemble your own and try to learn from those.