Anyone have Radiation-Induced Brachial Plexus Neuropathy?

Hello All, I am looking for people has more experience on late developed RIBN. 3 years after my bilateral Radiotherapy on my neck; I started to feel tingling on the upper left arm (deltoid) , then it spread to my bicep and tricep and it got weaker within 6-8 months and within a year I completely lost the function of left arm but my hand works, I have numbness on first 3 finger, I got very evident atrophy on my left arm muscles; after some time it also stared spreading to my right arm in the exact sequence; I am on the 7th month. but since right is my dominant arm I think it will take longer then 8-9 months it is now functioning 20%, my hand is working as the left one. in this 18 moths, I have tried Japanese medication called Radicut -(Ederavon), Cortisone steroids, hydrotherapy, physiotherapy, acupuncture, various medications (neurotin ecc), vitamins but nothing has help… I am desperate for a help… did anyone recovered from this and how?