Is there a link between PMS/PMDD, PCOS, Depression, SAD?

Question by tech: Is there a link between PMS/PMDD, PCOS, Depression, SAD?
I think there must be. I currently have PCOS, and suffer from PMDD (or very severe PMS). I have in the past suffered from depression, and I regularily suffer from SAD in January/February. I also have a low libido.

I really think my problems are hormonal, and I would love to find a magic cure for the above, or at least the PMDD!
Is there any kind of hormonal treatment that helps with these? Any ideas would be much

depression and anxiety scale