Hello @carlosaugusto, Welcome to Connect. I'm sorry to hear you have had to deal with the complications and the orchiectomy that followed. Three years is a long time to have to deal with no solutions that help. There is another discussion that I think you might find helpful:
--- Anyone considered bilateral orchiectomy: Why or why not?: https://connect.mayoclinic.org/discussion/bilateral-orchiectomy/

I did find some research on the topic that might be helpful:
"How do you treat testicular nerve pain?
Conservative therapy includes heat, ice, scrotal elevation, antibiotics, analgesics, NSAIDs, antidepressants (doxepin or amitriptyline), anticonvulsants (gabapentin and pregabalin), regional and local nerve blocks, pelvic floor physical therapy, biofeedback, acupuncture, and psychotherapy for at least 3 months."
--- Chronic Testicular Pain and Orchalgia: https://www.ncbi.nlm.nih.gov/books/NBK482481/

It sounds like you have seen many different doctors. Are you able to seek a second opinion?