Suggest Medication To Relief Pain And Neuralgia In Knee

sir, i am g.bangaram 32F in 2003 knee replacement was done to my Rt.leg in visakhapatnam that was failed and re operated in hyderabad kamineni by dr. j.v.s.vidyasagar. but till today i am facing with the severe neyralgia problem . lower limb nerve got stretched. doctors told this is permanent problem .kindly sugget any medicine to get relief from this pain. i cannot bear this pain.
thank you sir