Proton therapy? Question

I’m 70 years old, diagnosed with prostate cancer when I was 61, and I had and I had Proton Therapy on my prostate with a Gleason score 8
I have had severe pain in urination ever since and can’t get relief , from medication or stimulators .I pee 6-8 a night sometimes 10 my sleep is minimum and has been for 4 years and no doctor, has been able to help and I haven’t really found one who wants to investigate my case. My oncologist who performed the surgery, has just turned his back on me. I’m just left out here to find fin for myself , I’m looking for someone, that might point me to a doctor that , would take a look at my case ……….? If any one could help, I would greatly appreciate it.
Ref. To prosate help. Thanks 🙏