Suggest Remedy For Persistent Rectal Pain

i had mutiple hemorhoidectomy (surgery) in 1976. i was discharged with the expected rectal pain and a pain med (probably vicodin) which did not help-from what i understand is not effective on neurooogical pain (damaged nerves from the surgery). i have had this pain (drs. calling it proctalgia/proctodynea) for 38 years-off and on-- mostly on!!!! the pain now and has always been the same as the day i left the hospital. i am 74 yrs old.over the years i have seen/had dozens of drs., tests, lab., xrays, mri, meds,etc. with not one bit of help. it is has been very depressing and now along with my afib, spinal stenosis, neuropathy (both legs) and low grade rostate cancer i am at the point that i do not care to treat the prostate cancer-i have multiple pain scources(conditions)-treating the cancer may extend my already miserable life-for what? --to suffer longer?