It does sound like the same thing. Towards the end, Julie was at my feet at all times and seemingly afraid to be alone.
It was so very very sad. One of my other cats (as I mentioned two of them and they are brothers) saw me carrying her into the other room. He cocked his head and had a baffled look on his face for he had no idea what was wrong with her either. Julie herself seemed to have difficulty seeing it was noted and one vet I took her too told me she had no sensation in her spine for some odd reason (??).
Being my other two cats are also feral cats from the same shelter, I am surprised as to how very loving and caring they were toward Julie the last couple of months she was alive.
I'd post a picture of them but I'm too tired to figure out photobucket again at the moment.
It's been a very trying several months of sheer hell but I am glad I was there for her. Most people would have put her down long before I did but I couldn't find it in myself to do it until it really got that awful.
I hope you find out what is ailing your cat but wow, 20 years is a long life indeed for a cat!
Take care and thanks again.