A long time ago one of my cats just kept throwing up; they couldn't find anything. The vet put her on Tagamet (this was a long time ago; first generation extra strong tummy meds.) She was on small portions of A/D, almost like I was feeding a kitten. Lately they use Pepcid for kidney cats; this is basically the same type of meds. Do you have anything like that in Europe? I'm spacing on the generic name at the minute (famotadine, maybe?)

Good luck with your precious Luna.