My sister's hamster is sick. But we have no idea what to do. He's not doing anything, just lying there, and he won't eat or drink anything. We know he's still alive, cause he makes little skueaky noises when we touch him, or poke him. My sister's friend said that he might be choking on something, or might be comstipated (She said it happened to her friend's hamster) PLEASE HELP!