Thanks for your message. Unfortunately it sounds like your cat is very ill. Your veterinarian will be best able to tell you whether there is a chance of recovery or not from the nervous system disease. Is there any chance for a referral to a veterinary neurologist? If there is no chance of recovery, it may be kindest to consider euthanasia of your pet to prevent the considerable suffering that will occur with complete paralysis. I’m sorry that we can’t offer more advice from a distance.