I don't even know how to title this one..........

I am really really sad. My kitty is sick and I don't understand why. She spent the night at the vet's and $500.00 later they still want to run more (insert your own bad word here) tests. She has some liver damage, she was constipated again and dehydrated. They put her on antibiotics and some kind of liver medicine which they couldn't even tell me what it is what it does or how long she has to take it for. We are waiting to see what her kidneys look like and if she has feline leukemia. Get this, they told me because she was a ranch cat she had to be tested for feline leukemia and if she had it we would have to test our other cat as well. Well, it turns out 2 years ago we did have her tested and it was negative. Now their idea is that our other cat gave it to her. So, if the feline leukemia test is negative which I am sure it will be, they are going to want to do a ultrasound to check her gall bladder. And then what if everything is ok there? Then what will be next? We can't keep going on like this and I keep telling myself she is just a cat. But, she is not just any cat she is like a baby to me, she sleeps right beside me and she comforts me when I am lonely and she seems to understand everything I say to her. She is just a cat, right?