Hi Steffi,
welcome to Soulcysters! I hope you will find this site as helpful and empowering as I have.
Sorry your doctor doesn't see the light and won't prescribe Metformin. There is an herbal supplement/ treatment you can take that will hopefully have a similar effect. It is called Chromium, and I'm sure the cysters on the Alternative Remedies board will be able to give you more information. You can also run a search through the Research Articles section, which is highly recommendable and very informative. I personally don't believe in the pill as a treatment, in my opinion it only masks symptoms instead of making things better, but that is everyone's own choice.
Really the best thing you can do now is to start reading. There are quite a few things that might help you. For one thing, a different diet. Less cookies, more milk.

I have had great success with the Insulin Resistance diet. (You'll find some good info on it in the Diet/Exercise forum).
Bottom line: PCOS is bad, but it's not the end of the world. If your doctor won't help you and you cannot go to a different one, take matters in your own hands. It's your life, your health.