PCOS Help? Tips? Advice?

So I have PCOS. I have been put back on metformin. I stopped taking it in January because I got busy and saw it was no help but after stopping I gained 10 lbs. now my doctor wants me on it again and birth control. This time around I eat better and excerise but have lost no weight. I feel like all the doctors I have give me no advice on what to do. This time around the metformin is taking a toll with upset stomachs and dirrahea. Any help with condition. All I know is what I have googled.