I’m so sorry to hear that friend, I had a cat named Smokey when I was in high school who suffered a similar fate. He developed a brain tumor that caused him to sort of lose his personality and become distant and hostile towards my family. He never attacked us but he’d hiss and run off, also could barely walk in a straight line.
We eventually had to put him down to relive his suffering. And Smokey isn’t the only pet I’ve lost so I really feel for you, but you should know your cat loved you especially after wheat they likely went through prior to the shelter. Even if it is over now, I’m sure you gave your kitty the best life it could’ve possibly lived, and that is a very good thing

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