Your post really hits home for me. I had never had a pet live a LONG life until my "Siamese SOB". His name was Gobel McKenzie Reeves Greene. We called him Gobie. He lived for 2 months shy of 20 years. My son was 16 when he died and he had never known a single day of life that Gobie wasn't in. My husband is the REAL cat fancier in my family, but we all loved Gobie. He was a member of my family, dammit. Like your precious one, Gobie couldn't walk or see before he passed away. It gets me teary eyed even now (this was about 6 years ago). I still miss that cat. We have another cat now, but there ain't no way she will ever replace Gobie. He looked a lot like your cat, and I really feel your pain. Believe me, you will miss her, but she will be a lot better off than she is now. The pain will ease, but you will always have your wonderful memories of her. We still tell funny stories about Gobie, and probably always will. He was a character!
Anyway, (((((((((Jo))))))))))))
I don't know what your beliefs are, but I'm gonna pray for you anyway to feel better!