Glad he is doing well. My foster suffered stress related cystitis, and wet food only, extra water in his food and Cystaid helped him tremendously. Not all vets stock Cystaid though, but you can buy it online without a prescription, you just have to buy a large tub (250 capsules). For things like Cystaid, and Feliway, you can get them cheaper through places like VetUK and BestPet Pharmacy (they also sell things like Frontline and DRontal cheaper than your vet too), and if you go through some rescues, they get a 5% commission - let me know if you want a list of rescues that you can help by ordering through them.