Please do try the complementary therapies first. I have had great success on Agnus Castus (but it has to be 20mg standardised extract equivalent to 200mg whole fruit). There is plenty of research evidence out there (you can find some of it on my blog
http://julietocallaghan.wordpress.com/ search the category Agnus Castus). I have been reading about red clover and there is some research evidence for this as well, although I have not tried it.
When Agnus Castus was compared to prozac it worked equally as well without the side effects.
Stopping ovulation either chemically or surgically should be the last resort.