Hello! Close to a month ago (mid-September) our 10 y/o cat started acting out of character. She was hiding more and acting more lethargic, licking her nose a bunch, and we noticed she seemed like she was breathing heavier. We took her to a new vet where they did a complete workup. All of her bloodwork came back normal and the vet said that overall she was very healthy. He said her lungs sounded fine and didn't notice anything specific with her physical exam. He prescribed an antibiotic and a pain reliever and sent us on our way. Fast forward 2 weeks and she still wasn't better, still hiding some, not really having her normal appetite, and still breathing heavily (even more so). I called the vet and he called in 2 more weeks of an anti-biotic. Now another week has passed and she is still not better and still breathing heavily where you can see her stomach pushing in and out with every breath. Does anyone know what this could be or have any experience with this? Is it just a bad URI and is it just taking time to pass, or could it be something heart-related? Any insights are appreciated!