Sandra, I'm so sorry to hear this. Sometimes diet alone doesn't keep a cat from becoming blocked. My Storm was blocked 2 times and he had a lot of scar tissue so the ER vet recommended that he get the PU surgery. I know this is usually the last thing to try in a case like this. I hope that either a different diet or some meds may be able to help Samson. I'm glad to hear that he was finally able to pee. Lots of prayers and positive thoughts are being sent his way.