People with bipolar have their moods change more randomly, not due to a specific episode of mistreatment. And they will usually have either the manic or depressed stage last more than what you are describing.

Dissociative disorders in my experience are more extreme than what you are describing. According to my t, everybody has some kind of "parts" or ego states. In other words most people act/feel/respond differently in different situations. For example you might be different around your boss than around your kids. Most people are different when being treated kindly than when being treated unkindly.

Have you thought about exploring this stuff with a t? In my area I am told that bipolar is over-diagnosed and dissociative identity disorder is under-diagnosed. Perhaps you might benefit from assessment by a psychologist who has experience and training in diagnosis.