I got a 3 month old kitten a few weeks ago from the humane society. He's a real cutie and is very playful. When he came to me he had a cold (every cat at the humane society had it) and i was given antibiotics to give to him. Well, the cold went away and then I stopped giving him the meds. Now, he is sneezing again and his eyes are goopy. I am kind of concerned that I got a sickly kitten. the humane society sent me more antibiotics but I am not sure how long to give them. is this a bad sign that this cat will be sickly his whole life? any thoughts?