Heartbroken

My instinct was right.My poor kitty is quite sick.The vet said his bladder is badly bloated and filled with crystals so it hurt when he urinates.the vet did minor surgery to flush out the crystals in his bladder and he was sedated so that when we visited him he was still groggy and on a drip.he has to stay warded for 3 days to receive medication and scan to see his tecovery.The vet said i cant simply buy cheap kibbles that might have overly high salt content.im looking at cat food that can prevent urinary tract infection so the diet is important and cats cant eat food for humans like canned sardines in tomato sauce or tuna in brine.ive made awful mistakes in feeding him and turning to cat enthusiasts to learn to take better care of my darling furbaby.heartbroken to see him hospitalised