I'm so sorry to hear about Oliver. Hopefully you'll be able to help ease his pain. You might also want to ask your vet about Cosequin. I know it's supposed to help arthritis in cats but it can also help maintain the health of a cat's bladder. The inner lining of the bladder wall is protected by a layer which contains some of the same compounds as are found in cartilage. This layer prevents urine and waste products contained from seeping into and damaging the lining. Since the components of Cosequin are available to more than just cartilage cells, the bladder may use them to help support this protective layer. It comes in pill form and usually takes about 4-6 weeks to see any results but I think that some vets also have a liquid form that should be able to help your cat immediately. Good luck and please continue to keep us updated.