I'm not sure about it myself, as I am very low threshold and haven't had many of the problems that come with bipolar. However, I had a problem, sought help, got put on a medication, and have not had the problem since. I struggle with it too, but looking at it logically, being on the medication has stopped me from being uncontrollably angry or depressed. So at the very least I have reason to stay on the medication even if I question the accuracy of the diagnosis. Prefer to play it safe, y'know?