PCOD is not incurable disease nor it is a hindrance to conceive a child.
hence suppression of this disease may not be considered as material soa s to enable you to seek declaration of the marriage null and void.
If this disease alone is a bone of contention between you two then don't think in terms of dissolving the marriage.
There is no guarantee that a lady without these diseases would be able to beget a child or shower your life with all love and affection.
hence work this marriage out.This is your best bet.