My 14 year 9 month old female tuxedo short-hair has been having raspatory congestion for 5 plus months, she has been to 5 vets, on the same antibiotic 5 times which helps then the prescription runs out and I have to take her back to the vet to get another prescription. She had blood work 3 months ago that showed issues with her kidneys so she is supposed to eat a cat food designed for her condition. All the vets want to do is more blood draws and X-rays of her lungs and organs, this is costing thousands and I would like to try something more natural? ANY GOOD SUGGESTIONS?