Welcome to PT. I'm so sorry to her about your cat. It's so hard to watch them age and have health problems. So far I haven't had a cat with kidney problems but I've heard that giving them pepcid will help to stop or decrease their vomiting. You might want to ask your vet about this. A vitiamin B12 shot might also help her coat and it may also give her more energy. I hope that her vet visit goes well and that you'll be able to make her as comfortable as possible. I'll keep her in my thoughts and prayers.