PCOS and Weight Loss

We have been TTC for over 3 years now. I have been on Metformin for over a year. I have lost 35 lbs in the last year. But I have hit a plateau. I am at 243lbs. My doctor just tells me to count calories and work out and it should be all I need. So I have been diligent for awhile, counting, cardio, yoga, eating healthy. And not a single pound. Anyone have any tips? Or any encouragement? Or are in the same boat? TIA