katladyd - the vet seems confident that the diet change will do the job. Of course, I will be keeping a close eye on my boy (and the other boy and girl!).

Oscar had a bout with idiopathic cystitis a year or two after I got him - about a year after Cole joined the household. The two of them got along well, but as the vet said, even good stress is stress. There were virtually no crystals at the time, but a fair bit of blood. The vet agreed to try Feliway instead of antidepressants, and it worked!

So it's been about 5 or 6 years since there was any trouble. I'll be more diligent from now on.

I'll update tomorrow when he (hopefully) gets home!

Gayle, any emergency clinic was not only too far but sadly extremely unaffordable for me. If Oscar had not relaxed more and seemed more comfy last night, I would have gone in.

Thanks, everyone.