Advice on a sick cat..........?

Get her to the vet and say that you will drop the money in or borrow it, this cat could die. My neighbour had a house cat, so obviously didnt get her spayed, she had symptoms very similar to yours, and died of peritonitis because she had an internal infection, she was given antibiotics at first and seemed to get better, then went downhill very fast and died. She is obviously in pain and ill so id get her to the vet sooner rather than later. Vets are usually pretty good about money, just take her and quick!!!!