if there is staph infection then it can be proved by blood culture
. have you done any blood culture. long term iv access can lead to staph colonization. what are the medications used for neuropathic pain? though it is difficult to control still some options like tricyclic antidepressant , some anticonvulsants like carbamazepine
etc can be tried. morphine
is also an option. please consult your doctor . I am sure you will get relieved from your distress .