bone scan

Good morning, any info would be helpful, quick summary I'm 67 years old, coming off two previous cancers. I was diagnosed with prostate cancer, Gleason score of 9, two years ago. Finished my ADT therapy along with 42 x radiotherapy. I had no cancer outside of the prostate. My PSA is great >.3., but my testrone number is zero. I have been having severe pain in my joints ( wrists , hands, knees) also pain in my hip and back. My oncologist ordered a full bone scan. Just seeing if anyone had similar experience. I feel like I'm 90 . I know that the ADT effects' the joints, Is there any treatment that can help ?