Lydia,
I would make an appointment with on oncologist. My husband was diagnosed with CIS bladder cancer. He experienced pain in his neck and lower back. All his doctors initially attributed the pain to his osteoarthritis.
A post operative biopsy following bladder removal & reconstruction surgery showed that pain was due to mets to the spine.
I pray that your situation is not the same as ours. If it is cancer, the sooner he recieves treatment the better the prognosis.
Michelle