Our "kitty" had CRF, she was also blind (due to the first owner giving her dog food instead of cat food that has the essential TAURINE in it) and she also had many other problems.
now having said all of that she was the sweetest cat you could ever know and we hoped that she might have gone on for a few years longer but unfortunately she she passed away after being really bad for only a short time.
Rest in Peace Mia
as other have said you can only do your best and sometimes that means saying goodbye ,remember the good times you had with Mia
my thoughts are with you and anyone who has to go through the grieving process.

G

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In Egypt,the cats...afford evidence that animal nature is not altogether intractable,but that when well-treated they are good at remembering kindness
AELIAN(roman writer)

http://www.soyouhavelostyourcat.co.uk