Hello. I know you posted a couple of years ago but I hope you don't mind me asking for some advice? My cat is experiencing the same problem and my vet has also frightened us by mentioning a brain tumour. She does seem to be improving on oral antibiotics - antirobe 25mg x 2 twice a day. Do you mind very much if I ask you about the outcome for your lovely cat? Our cat is 14 and three quarters - not old in cat terms. She has had all the blood tests during a day spent in the vets. They have sent away tests for viruses and toxoplasmosis. I am due back to the vet Friday evening. We are very worried! Thank you so much.