Small fibre neuropathy after nerve block

Hi, My nerve problem has been started iñ 2015 after i had an operation of epidymal cyst from left scrotal.After the cyst removal chronic scrotal pain has started to me bilateral , i could not able to wear even underwear properly because of pain ,this severe pa8n things go for 4 years after that a ray of hope is seen.i had got nerve block injections bilateral in illuingunal and genitofemoral nerve ,around 14 nerve  block  injections has been triggered.Around at 9th injection i had some mild burning sensation started over on my pelvic and high area.This burning starts increasing and today i m having burning in legs ,buttocks , pelvic area with feeling like my someone put heated pan on my leg ,buttocks or sometimes feel like cold ice has been put.Currently i have gone with NCV test and it shows as small fibre neuropathy.Doctor advised me to take duzela and  b12 supplements .But i didnt find much improvement .Is this thing has any cure ,what medicines need to be taken?,please advice.