serious numbness?.....serious help please!?

well in its in both my feet n hands, i cant feel a singlething. even da temperature of a boiling water, cant feel it with my hands. its been like tis for bout six montshs n its not gettin any better but worse by the second. i've been to da emergency room n they culdnt figure out wats wrong with me. MRI's n bloods test came bak negative for any sort of disease or sickness. they send me to a neurologist and he cant quite seem to find da main cause of da numbness. he said that i might have sum sort of nerve disease. and heres my question?....i am about to have da neurologist test my nerves, for bout 1500 dollars n dat is a lot of MONEY for me. is it really gonna worth it?.....a lil bit of me; weight:138 height;5'8 and i can a run a mile in thirteen minutes sooo yaeh twell me wat ya think.