Judi, probably not what you want to read but I wonder if your husband knows exactly what the situation is and is choosing not to tell you everything? If the nurse is usually excellent but is suddenly not responding, your OH may have specified that he does not want you to be told.
I think before you contact the hospital again, you might perhaps be able to have a frank conversation with him and ask if he knows whether the nurse is avoiding calling you.
Has he discussed with you what treatment they are giving him? Is he still on hormones? Has he mentioned whether they discussed chemo or any of the newer drugs? If not, ask him. He can't be forced to tell you but some of this will have been discussed with him when it was found in his lung, not just at the most recent appointment when the results were 'not available'. Sorry if I am completely wrong but this just does not ring true at the moment.