PCOS – is it reversible?

I think I have PCOS. I have irregular periods, and the doctor didn't seem too bothered. She just said, "Well it might be PCOS" and that was the end of that! I've read online that it can lead to all sorts of other issues, and I'm concerned now. I'm not trying to conceive, and won't be for a long time yet, but the other health issues are what bother me.

I have darker patches of skin under my breasts, and have hair growth which isn't really "normal" (I don't have a moustache or beard though). I know that both of these are symptoms. I'm also rather overweight and I know that this has very strong links to PCOS. I don't want to go back to the doctor about it because it seems that they couldn't care less, but I want to try and improve my health.

I've recently started taking Cerazette (mini-pill), so I expect my periods to differ now, but I want to sort out my weight, and hopefully improve my skin, etc. Is PCOS reversible? If I got down to a healthy weight (I need to lose 6 to 7 stone to be an average weight – I'm currently a size 20 (UK) and would like to be a 12-14) would the symptoms disappear (or lessen)?