i have no knowlege on this subject, but have you considered donor sperm? just food for thought...God Bless!!
My husband was diagnosed with varioceles, where there the vein gets so overheated that it kills the sperm, so his sperm count is extremely low. He underwent surgery (count still low)and every since then we have gotten pregnant, although be it from IUI's (I think the second tine, that was all us). We lost the babies, BUT coming from thinking that we could not conceive at all to conceiving three times is a GOD sent!!
Keep the faith. I believe it can happen. There is nothing that God can't do. Just ask.