Seeking Advice on Possible Bipolar Disorder Diagnosis

I hesitated to add bipolar disorder to my profile because it's something I've only so far briefly discussed with my psychiatrist, and I haven't been formally diagnosed. But it does seem to make sense. I tend to live in manic/depressive streaks. I'm a novelist, and I will go weeks or months where I'm writing, writing, writing, it's all I think about or want to do, it's almost obsessive. Then suddenly, all interest is lost and I don't return to it for weeks or months. There are other interests and areas of my life where I run like this. It also explains why the lightweight medications that barely worked for a long time suddenly weren't cutting it anymore. I went from an antidepressant/anti-anxiety regimen to a brand new antidepressant/anti-anxiety/double antipsychotic regimen, following a full-on mental breakdown. Is there anyone out there with experience with BPD who can tell me if my doctor and I are on the right track?