I've never really had a problem accepting my diagnosis, because I (partially) diagnosed myself before I ever received treatment or a formal diagnosis. I say partially, because I suspected bipolar, and it turned out to be schizoaffective in the end, but close enough. I try to remain positive about my illnesses, in fact, I try to embrace them. I look at the insight, the creativity, the compassion they give me, as opposed to the negative aspects of them. Granted, ask me when I'm depressed, and I'll probably give you a completely different answer, but that's the nature of the beast, I think.

Just try to remember, accepting the diagnosis is in no way submitting to it. Just because you agree that it is there does not mean that it will control every aspect of you life. Illness or not, it is still your life to live.