I Have Been Having Trouble With My Legs Going To

I have been having trouble with my legs going to asleep & feet...cannot walk on my feet they hurt, it's like walking on rocks..I have had both a nerve & vein testing done ( both normal) also checked for blood clots.
Dr. wants to try muscle relaxes next. I'm in Stage 4 kidney failure, 3rd time for ovarian cancer ( not on chemo) but previously twice & hear patient. I had been told I have neuropathy? I'm on neutron for it. My feet & legs go to asleep while I sit with elevated...what else could this be??? can not take potassium ( high).. any help will be appreciated...Thanks