I'm taking metformin to help with ttc with pcos but my understanding is that the reason it helps with ttc is because it helps regulate your homrones thus your cycles. Do you want to ttc again? If you do I personally wouldn't go back on the pill, because it really messes with your cycles and can take ages to get back (as you probably know). If you don't want to ttc again then the pill will prob be a good way to help with the pcos symptoms.

As for naturally bringing on AF, my naturopath had me on vitex (or chaste tree) to help, but in my case it didn't (but I have other issues besides pcos so its no indication of it not working!). What finally worked for me was primolut n (like provera). I took it for 5 days and AF arrived yesterday, 4 days after I stopped taking it.

Hope that helped!