We had a cat with a similar problem when I was a young man. It sounds like you have already done all the correct steps: taken to a vet, got diagnosis and treatment, received medications for home treatment, etc. The diabetes is a complicating factor. Here is a helpful page, but you probably know all of the steps already:
https://www.wikihow.com/Diagnose-and...atitis-in-Cats
I am very sorry to read that your cat is so unwell. At least he is at home with you, where he is getting love and care. Every best wish to you!
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