This is pretty much what Pete has. Pete had repeated blockages for no apparent reason, until he had his PU surgery. The surgery stopped the blocks, but the underlying condition is still there.
Has Sunny had an ultrasound of his bladder? Sometimes that will help identify issues that are missed in urine testing.
Pete used to get injections of Adequan--basically Cosequin in liquid form. It's used for dogs with athritis. There is no proof that it helps cats with FLUTD, however, it does seem to. It helped Pete immensely. Immediately following his surgery, he got an injection once a week. That went on for about 4 months. Then he went to bi-weekly, eventually monthly. He's been off it for about a year now (surgery was 3 years ago) My vet told me there were no negative side effects and if nothing else, Pete should have very healthy joints!
Cranberry extract sometimes helps too-just like it does for women. I buy the caplets and crack them open, sprinkle the stuff on their food. It can't hurt, even if it doesn't help!
You might also want to ask about using amitriptylene. It's a triphasic anti-depresant in humans. Pete was on it for awhile. My vet thought that Pete's problems could be stemming from stress and emotional issues. The ami kept him calm and made him more relaxed. I didn't keep him on it for long as it changed his personality too much for my liking, but I've been told that Pete did not have a typical reaction to the drug. Apparently for most cats, they react much less. Pete was a space cadet on it!
How old is Sunny? Pete started blocking as a very young cat, barely 2. He's almost 6 now. He appears to be outgrowing the problem. My vet told me that he often sees this when a cat develops idopathic urinary tract problems--the cat outgows it as they age. This seems to be happening for Petey. Twicket also had urinary tract problems as a young cat that had stopped by the time I got him.
What kind of food does Sunny eat? My vet recommended a strictly wet food diet for Pete with no fish flavors. Pete did not agree. So we comprimised....Hill's C/D dry is left out for him and everyone else to graze on. The other cats get some wet food every morning. Pete gets half a can of Hill's C/D minced chicken at the same time and a bit more in the evenings. Sometimes the urinary tract problems can be aggravated by lack of water intake. Wet food can help solve that part.
Good luck. FLUTD is a frustrating condition to deal with, especially when no cause can be identified.
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