Bless you skeeter, I pray to God you get some relief today from your pain. I dont have nerve pain but i completely understand the "burning hell" feeling, as I have chronic pain in my throat and face....please dont give up and keep praying for healing Hashem is with you...
Just wondering, what symptoms do you have that make you think you might be in renal failure? You can usually tell if there is a bad problem if you have trouble urinating, there is extremely limited output, and what urine there is is usually very dark in color(kidney's not filtering well). Does this sound like what you are experiencing? Renal failure can be lethal in a very short period of time, so if you think this is happening, go to the ER immediately...do not pass go, do not collect $200(ok, lame Monopoly reference). IN ALL SERIOUSNESS...get help NOW!!! Please update us as soon as you can. I know we will all be worrying about you. Take care.