Worried for my husband

My husband's prostate cancer, Gleason 9 has now spread to spine, sternum, clavicle, ribs, pelvis and scapula with uptake in his lymph nodes. His steroids and hormone treatment has been stopped and he has just had his second Radium 231 treatment, I have never seen him in so much pain. His hands and arms are numb each morning and pain in his legs. He has telephoned for advice and advised to ring his GP on Monday as it could be sciatica!!!  Has anyone tried this treatment with positive results. It is heartbreaking to see this everyday