Lymph Node cancer left axillary. Stage 4

I chose surgery instead of chemotherapy for my diagnosis bc i already had Neuropathy in my feet n legs. This was followed up with 5 weeks of radiation, which has now affected me 10 years later.
My left shoulder and upper arm are barely mobile bc of tge excruciating pain. I understand that the radiation blew out my shoulder so no longer is ut easily moved.
I am wondering what, if anything i can do or take to rectify this painful problem. HELP!