Oh Donna, my heart is breaking for you and sweet Casey. A kitty couldn't ask for a more caring and loving Mommy. I know how frightened, frustrated and confused you feel right now. I wish I had an answer for you as how to proceed. I would definitely discuss all my feelings with the vet. Perhpas the slide results will give you some answers. We're sending you our love and prayers. {{{hugs}}} Sandra, Mr. B and Oliver