PCOS/Hashimoto Thyrioditis

I'm TTC since I was 19 and I'm now 20. I know with having PCOS and thyroid issues it makes it 10x harder. It's so hard being around my friends that have kids. I cry about it and pretend I'm happy. My period is never on time with or without provera. I've lost 20 pounds in about 7 months so I figured losing some weight would help but I still can't seem to get pregnant. Does anyone recommend a vitamin to help? Sorry this is long but this is my first time posting.