My 4 year old male cat has recently been diagnosed with a fairly severe case of ringworm. It was given to him by our new addition, a 3 month old male kitten brought home from the same shelter as the first. Now, the 4 year old is beginning to lose hair on his head, nose, and paws, and is not urinating or defecating as frequently. He also appears to be limping and has been spending more time hiding in darker places like closets and under desks. What's happening to him?