C.H.
I was diagnosed with PCOS (or at least that was suspected when I went to an OB/GYN for infertility), and underwent several cycles of clomid without success for 1.5 years. I also had very irregular periods since I hit puberty, and had trouble losing weight. We also tried Metformin since it is believed that PCOS could be caused by insulin resistence. (I'm SO not a doctor, please look into all this information for yourself, or ask your doctor, since I'm sure I'm not getting the wording exactly right.)
I found out later that I was wheat intolerant (I went off all wheat products for a month, then when I tried them again they made me feel bloated and messed with my digestion), stopped eating wheat, and shortly thereafter had a sucessful pregnancy. Since the pregnancy, I've been having more regular periods and less intestinal trouble (I still have trouble with my weight, sigh). I really think going wheat-free helped my cycle, and I've read since that many women diagnosed with PCOS are wheat-intolerant (in this case PCOS is a description of a symptom rather than a cause).
Do look into wheat-intolerance, it may seem like a hard thing to give up wheat, but with growing awareness of celiac's disease (a more serious wheat allergy), there are more products on the market than there were even five years ago. And if you like to bake, there are a variety of flours and cookbooks to help you make your favorite things wheat-free (which is probably why I still can't lose weight...) And going wheat-free was much less stressful for me than doing infertility treatments!