I was diagnosed with PCOS in my 20s. It was pretty severe, my ovaries looked like bunches of grapes on the scans. I was prescribed metformin to deal with insulin resistance and told I'd need clomid or other treatment to have children.
The metformin disagreed with me, so on the advice of a professor of endocrinology I cut sugar from my diet, ate low GI, took up a fairly rigorous exercise regime, and really worked at becoming as fit and healthy as was humanly possible. When I did eventually decide to try for a family I fell pregnant within 6 weeks of coming off the pill. Scans have shown my ovaries are 100% cyst free.
So, if anyone wonders why I bang on constantly about the benefits of low GI eating, exercise, and being neither over or under weight there is your answer. It is a battle sometimes though, as women everywhere seem hell bent on force feeding me sugary foods. Why why why????!!! I could go back to my old diet, but then the cysts might return and I would scupper my chances of ever having DC2. Cake really isn't worth it.
My only advice is look after your body, treat it as a very delicate machine that needs care. Feed it well, keep it exercised, get enough sleep, steer clear of alcohol, smoke, sugar, drugs and people who are likely to press any of those on you. It can only help. I really hope you have a happy outcome soon. MCs are so hard, and often unexplained. A family member had 8 before her much longed for daughter arrived. Big hugs.