Our cat vomited about 4 times early this morning. She hasn't eaten or drunk anything all day. She's been lethargic all day - she's normally an outdoor cat but hasn't wanted to go out. She's feeling sorry for herself. I called the vet earlier and they said give it until tomorrow, but it's now been the whole day she hasn't eaten or drunk anything. She's unhappy, she's lethargic, she's weak from not eating all day. What might be wrong with her? We're really worried now. It was around lunchtime when I spoke to the vet, so I was sure she would have eaten something by the evening, but still no.