nerve pain and foot drop

[ZACHURY]

11 yeas after my bracial plexus injury im now suffering from horrible pain in my shoulder and stump. it feels like im being stabbed by a knife and also like my stump is being constricted. ive seen a few doctors and tried injections, electric units, non narcotics, and therapies but nothing works. the only thing i havent tried is opiates and thats becuase no doctors in my area will prescribe them to me. im in horrible pain and need some help. also my right leg is smaller than my left leg causing me to lose motor function, suffer from foot drop, and it feels like i have a constant charlie horse. i had a bone density scan but nothing was shown. i cant get a mri due to metallic clips in my chest. please help