I am going through something similar and I feel your pain. My husband was just diagnosed with obstructive azoospermia (spelling) or somethimg like that. Did they say your husband is producing sperm? They can tell if everything seems normal from the blood tests.
Mine has a blockage and there is no sperm present in any samples. He's gone through the blood testing and everything is fine, no genetic issues. We are meeting with an IVF doctor in 3 weeks to discuss our options.
They tell us they can try to repair the blockage and look for sperm in the testes and do an IVF/ICSI at the same time, otherwise, if the blockage cannot be repaired we're looking at donors.
A light at the end of the tunnel right about now would be nice..