2 days ago I lost my 16 1/2 year old cat, Lyndsey. He had been on heart medicine since May 2007 and I just felt so good about how he had been doing. But then last Saturday he threw up and his breathing was labored. He had maybe 1 or 2 days last week that were good and the doctor increased his medicine. But then 2 days ago, he laid down on the floor and kept meowing really low. He seemed dazed and then he ran to the basement. Once he was down there, he kept meowing and panting. He peed on the floor, which he's never done in 16 years. I took him to the emergency vet and they gave him a pain med (shot). The vet said he seemed like he had pain in his abdomen and fluid around his lungs. We went home and he seemed to get worse with his breathing. His breathing was very fast and it sounded like he was squeaking. My husband and I decided that was enough and we took him to the vet and had him put to sleep. Has anyone experienced this? I feel sick and empty. I can't eat or sleep. Nothing helps and I keep second guessing myself. Has anyone felt like this?