No doctor has all the answers or will immediately know what's right for you... and some of them don't really care. But, having said that, there are a lot of good ones out there who sometimes just need a bit of a push to work with you.
Gather some information about the symptoms you are most concered about and what you think you should be offered for treatment and take it with you. This site has loads of info and the Mayo Clinic website is a very credible source as are many others. Print it off and bring it to your appointment.
A good doctor will consider it, look into it, and work with you to find the best treatments for you. A bad doctor will dismiss it, or pretend to know everything already, and you'll find yourself leaving without the answers or treatment you feel is right for you. Best to change doctors if that happens.
Metformin isn't right for everyone, and it can be difficult to get used to taking it because it has some unfortunate side effects -- like needing to know where the nearest bathroom is at all times. The extended release version is by far the easiest to take and you should take your time working up to a full dose.
If it is what you need, then you should be prepared for that. It does work, for both insulin resistance and diabetes, but it probably wouldn't be prescribed if you don't have IR or diabetes unless you've tried other options first without success.
I had to convince my first endo that I had insulin resistance and hypoglycemia by testing my blood sugar and keeping a diary of readings through the day for a couple of weeks... even though I have so many other symptoms of PCOS she didn't believe me. I've changed doctors since then and found a very good one that I now use.
Do your homework and go into your next appointment with a good idea of what you want and enough information to support it and it will give you a better chance of leaving the office with what you need rather than just what the doctor wants to give you. | 
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