My Husband Had Prostate Cancer Last Year. He Was Treated

My husband had prostate cancer last year. He was treated with Lupron, 25 external radiation treatments, then had 88 radioactive seeds implanted in his prostate in Sept of 2017. He started to notice a lot of pain in his hips around Jan 2018, and has experienced swelling in his right leg, and numbness/sensitivity in his right foot. He is currently taking physical therapy, and the therapist is not sure how to treat him. He has had a bone scan and an MRI in the past 3 weeks both of which are clear/negative for cancer or pinched or bulging disks in his back. We aren't sure what type of specialist we should see about the symptoms that he is experiencing.