I Had Prostate Surgery And Also Radiation In 2018. Since
You can try penile injections
Hello dear welcome to Ask a doctor's service.
I read your query and here is my advice.
I don't think that masturbation may have caused any damage to penis making you not to have an erection and orgasm.
I think that the main cause of ED in this case can be radiation.
I believe that penile injections that your urologist recommended may be helpful to provide an erection. You may follow his advice.
Let me know if I can assist you further.