I have a 15yr old cat who has been treated for a virus that makes him cough with antibiotics when it flares up for the last 2 years. The Vet took cultures from his lungs but the results were inconclusive so we agreed on antibiotics when he needed them.
He had a flare up of the cough recently that also seemed to be accompanied by vomiting and drinking lots of water so we went back to the vets. They did bloods and ruled out anything wrong with his kidneys, thyroid and he's not diabetic. They prescribed antibiotics for 2 weeks and in that time everything cleared up apart from he was sick a couple of times. 2 weeks post meds and the vomiting is back and he sometimes coughs straight after.
He seems hungry but won't touch wet food at the moment. He'll eat dry but guzzles water straight after and vomits it all back up. I tried him with some ham earlier but that didn't even hit his stomach before it came straight back up. I'm obviously going to take him back to the vet but would be interested to hear if anything has experienced similar with their cat? I was convinced the bloods were going to show something but seems not.