Same thing happened to my 7 yr old male cat. Took him to the vet, and I was told he had been poisoned. Either by a rat poison or anti-freeze. Labs revealed he had an irritated liver. He spent 5 days with IV therapy, & antibiotics. Can home one sick cat. But ate on his own, drank, too. Had trouble walking, would fall over if he tried to jump. Now, 10 days later, he walks, jumps (some), and is on his way back to being himself. The vet put him on liver enzymes, too. Oh, his gum's are no longer yellow. He's a great cat. I'm happy to have him in the family.
