I have a 13 year old cat. He has always been healthy. For the past three weeks he has been throwing up everything that he eats. We took him to the vet and he had blood work done. Everything came back negative. He still continued to eat for about a week and would still throw up his food. Well, this past week he has stopped eating all together. He wants to eat b/c he rushes up to his food bowl but will just turn away. He have tried so many different foods and we won't eat any of them. This past week he has also started acting strange. He has started ripping the wall paper down from the wall. He does this every morning. He didn't even do this when he was a kitten. He also messed up the blinds in one of the windows by chewing on it and bending it which he has never done before eaither. The vet doesn't have any answers for us. I'm afraid the vet is missing something, and my cat will continue to get worse. Does anyone know what could be wrong. Please help. Opend to suggestions.