We are so very sorry that Filou is not improving. We too have been through this with our very first cat - Roady. All we can tell you is that there were good days and bad days, but we had her for a long time after it was first diagnosed (2+ years). We did the fluids, a diet combo (K/D and high quality protein like chicken or egg whites were recommended by our vet) and just gave her the best care and love we could for as long as we could.
We hope Filou starts to respond to the treatments and will have many more years to be with his loving family.

The Tribe