Yep, you will find good results with metformin regulating your hormones. Basically what it does is balance out your hormones so that you will be at a better place to conceive. I realize that just simplified it but basically thats what it does. Do some research on PCOS and metformin. I don't know who said you can't test for PCOS, but they were wrong. You can test for it with lab work and ultrasounds. Typical PCOS will have a "string of pearls" on your ovaries. Classic PCOS will have excessive hair growth, obesity, infertility, acne, etc. But you will also find women who are thin and have PCOS.
If you have been sick with it, ask for the XR - extended release. Start with taking 2 at night. Then if you have to increase, increase it at night with the XR. You will have less side effects with the XR. Also, watch your diet. Always balance out your carbs and proteins and DON'T DO FRIED! There are some really good websites that you can look at.
I hope this information helps.