Hello,
I’m sorry to hear about your cat. I don’t know what to say about this as I don’t know the full extent of his issue. If the vet thinks he needs the urinary catheter in place for multiple days is it possible for him to go home with it in? Or be transferred somewhere that is more affordable? I would ask these questions. Also can he be given medication to help with anything? Perhaps a steroid or anti inflammatory?
See if there are any options for you?
Best of luck
Look into raw feeding. Ask your vet about it.
I assume the abx are administered orally? My one cat would drool if a tablet tasted awful. Are you giving it in a pill pocket or some other delivery device?