bipolar definitions

How do you know if you're bipolar?
When I read the definition of bipolar disorder sometimes I look good, but sometimes not. I do not do things crazy like buying too much or travel abroad or to do things quite audacious. However, my husband thinks it may be fair, based on my mood. Perhaps a milder case. He says I'm fickle, easily distracted, the mood changed quickly. I thought it was borderline personality disorder. Who knows maybe I am all the above.
usually marked mood swings, sometimes quick thinking Doesn, t sound like a personality Disor – possible depression or PMS
Episode_4_Britneyzian Prophecy-Britney’s Prophecy