Um, traditional Bipolar like what I have, my mood "episodes" last weeks or months. I was depressed for 7 months last time.

Some Bipolar 2 may have "rapid cycling" or "ultra-cycling" where they experience mood swings throughout the day. This tends to be a more conterversial diagnosis, because mood swings happen. But there are still criteria for episodes.

Your mood changes could also just be normal moods. There are criteria that T's and docs use to "label" and you could look at those criteria in the DSM IV.
But honestly, many of the symptoms and criteria overlap. Honestly, the only criteria that makes a Borderline label more likely is an intense fear of abandonment. The other criteria are similar in BPD and Bipolar 2.

That being said.....maybe you should just stop focusing on a "label" and focus on feelings and symptoms.