Didn't want you to go unanswered.
Sorry to hear you have PCOS - me too! But sadly, I have no answers for you. It sounds like you're fairly clued up about everything, having been through clomid before. (Interested to hear why it was so hellish, though).
People rave about angus castus, but don't know really. Varying opinions, as it is quite a strong herb, apparently, so you're self medicating. Doctors dismiss it.
Metformin, the diabetic drug, is sometimes prescribed...whether that would do any good? I know some people on other threads have found it helped the other sypmtoms of PCOS, although whether it regulates your cycle too, i'm not sure.
I'm trying to make sure I have lots of mutli-vitamins. Including B complex vitamins, calcium, magnestium, zinc, etc. I have the opposite problem to you, though, and have managed to increase my cycle from 17 days to 23!! Not pg yet, though.
Acupuncture? Reflexology?
Good luck and tell me the magic spell when you find it!! 