My 14 year old kitty was just diagnosed with lung cancer. She has pleural effusion and had a thoracocentesis Saturday removing one cup of fluid. But after 36 hours her breathing is harsh again. With chest heaving. The vet gave me no instructions for palliative care. Only a list of oncologists should I want to pursue chemotherapy. I'm trying to keep her comfortable until her oncologist appointment October 3rd. My friend said Lasix makes the cat urinate more often and would not lessen pleural effusion. Anyone have experience with this? I called the vet's office to ask this morning but so far there is no response. Thanks.