i know how you feel i have 7 cats and i may not be a Dr. but i know what i am talking about! i would say that your cat should be alright i to think that it is just a hairball. it is not likly that a cat would try to eat somthing so big it could block anything. but just to be shure (like i said before i am not a Dr.) i would mostly listen to the Dr. and try your best to take good care of your cat (and watch what it is eating!) hope your cat gets better!