I have been diagnosed Bipolar 1 four different times by four different mental healthcare professionals, and I still don't believe it sometimes. But like piano97 said, it's just part of the illness. In the meantime, I take my meds regularly and use my light box and eat (mostly) healthy food, and I make sure to get adequate amounts of sleep. I know I have to do those things just in case the diagnosis is accurate, because I don't want to find out what could happen if I didn't.