Oreo is only a few months old and has recently been having some health issues. A week ago, he was weak and threw up a thick pile, and after some rest and shallow breathing, he seemed back to health. Unfortunately, this week the issues have returned even worse. He has been weak, he won't eat anything, he drinks water and vomits it back up, and he isn't his usual energetic self. Please help us. We don't have the money to take him to the vet or anything. Anything helps.