Birth control helps your period regulate. I would take it to get your period on track then get off of it when you are ready and trust your body enough to do it on your own. That worked for my friend with irregular periods.
I have PCOS too, and I have something that could really help you it's Gaia Chasteberry. It's supposed to help women like us to regulate us...It's worth a shot, but you have to take it faithfully for 3 months at least. Don't give up! You can buy chasteberry on amazon or health vitamin stores..
It also might be a good idea to see a fertility specialist and see what they have to say.