Hey Soup,
Perhaps you could go to your doctor or go to a psychiatrist and talk to them about the symptoms, that way they may have a better idea on how to help or if you do infact have BP II?
I think the book you read is right in saying that it can be hard to diagnose certain conditions as the symptoms overlap other conditions but perhaps a psychatric assessment and working with a psychiatrist over a period of time would give you the answer?
It sounds like you have felt upset about this for a long time.

