It sounds like it may be a virus causing the fever. It also sounds like the head tilt is neurological, also possibly caused by the virus.
I went through this with a cat of mine. It was of unknown origin, but 2 rounds of antibiotics plus daily prednisone got her healthy again. She had a slight head tilt for the rest of her life though.
Don't stop the antibiotics in the meantime. Do ask the vet about prednisone.
Let us know what the vet says tomorrow. I hope he continues to improve. Is he still eating well?
You can upload the video to YouTube, then post the link here.
I went through this with a cat of mine. It was of unknown origin, but 2 rounds of antibiotics plus daily prednisone got her healthy again. She had a slight head tilt for the rest of her life though.
Don't stop the antibiotics in the meantime. Do ask the vet about prednisone.
Let us know what the vet says tomorrow. I hope he continues to improve. Is he still eating well?
You can upload the video to YouTube, then post the link here.