The same kind of thing happened with my kitty Baby. He seemed to always have "peeing" issues and it had gotten to the point where my parents were threatening to have him placed else were. Finally, after he had been on numerous trials of antibiotics and steroids, my vet suggested that I give him a quarter of a vitamin C pill, for basically the rest of his life. After I had given him this for a month or so, his peeing did become more manageable (although he did have an accident here and there). If I am remembering correctly, the vitamin C made his urine more acidic, therefore decreasing any bacteria, etc. There would be times where we would take him in and he had a fever and everything, and then other times where his urine looked fine. It was stressful and I know exactly how you feel.