While Yoga is beneficial for controlling the complications involved in PCOD/PCOS, yet to say that the impact would be permanent will be a bit far fetched. Yoga, you see is a way of life. To feel the kind of benefits it has or can have, one needs to be committed to it and be regular with it. Yoga, just like any good and sustainable solution takes time to benefit.
So, if you are taking up Yoga for helping with your PCOD overall, you can read about it in detail on http://bit.ly/2U2JKle
However, if you are looking at immediate relief, our suggestion would be that you should visit a doctor for the same.