I just adopted Wendal, a three year old tabby from a local humane society a weekk ago. He was declawed and nuetered 8 days ago.he came with about 3 days worth of amoxicillin. i noticed he was shaking his head and scratching at his ears and they were very dirty inside, i called the vet and they gave me ear drops and more amoxicillin with pain medicine. and now he is sqinting one eye and it has yellowish white thick discharge. What could it be? he isnt sneezing at all and its only in the one eye.