My Husband Has Papillary Thyroid Carcinoma Which Has Spread The bones

Papillary Carcinoma of the Thyroid

My husband has papillary thyroid carcinoma which has spread the bones, primarily his backbone and ribs. He has had surgery to remove the thyroid gland, which was free of cancer, and two surgeries to remove lymph glands from the right side of his neck which were cancerous. He has had 3 rounds of radioactive iodine and tried to take Nexavar, but was unable to tolerate the side effects, and it apparently did not do any good anyway. He is beginning to have quite a lot of pain in his back. He has been using an electrical muscle stimulator on his back with varied results. What other treatment options does he have? The cancer seems to have gotten aggressive recently and his doctor doesn't seem to know what to do next. I am, quite frankly, scared for him.