GET YOUR KITTY TO THE VET ASAP!!! It could either be hyperthyroidism, or CRF (chronic renal failure). I just lost my 14 1/2 yr old Athena to CRF + hyperthyroidism. I have read that methimazole, which contols hyperT, can lead to CRF. Please get your kitty to the vet before it's too late. Get...