Ok, sorry for the technical info, but BF happened to be studying PCOD this week so here are the three criteria. To be diagnosed with the disease, you need to fill two of these:

1/ ovarian cysts
2/ high male-hormone levels (eventually associated with masculine features like high pilosity, low, tick voice, etc.)
3/ anovulation (no ovulation -> but of course you can have no ovulations and still have periods, just like anyone on the pill can experience)

Insulin resistance is one of the consequences, not sure it's a cause...

I am not sure whether having a diagnosis makes a real difference in treatment. Moreover, I DO NOT ADVOCATE self-diagnosis. See your doctor, and get a second opinion if you feel it is necessary.

Good luck to all of you...