That's a good idea skyrider, I am rural though but I might check out some websites and find some info. You never know someone might do a skype consultation

I'm sure I've read somewhere that cats / dogs that constantly sit and stare at nothing, or repeatedly bump their heads against the wall, may have a brain tumour.

Have you mentioned the sitting /staring to the vet as well??

Thanks B3, she had nearly 200 dollars worth of blood tests, the vet said some levels were up but nothing that indicates anything serious. Soooo the plan is she will go out in a cat enclosure attached to the house (its almost like an add on room but has a sliding door glass front, some tralise (sp?) on the side, a concrete floor which I will also put lino down.  Its reasonably large 2.8 x 2m I'll spend time with her in their and try to retrain her with the litter box.  If she doesn't improve in the next week or goes down hill I will get a second opinion from a vet.