I am so sorry for you Ryan. I know how you feel too. My kitty, Liza (RB) died of kidney failure due to cancer. I think she had not felt well for awhile, but I did not notice in time. She was getting a little older, and I just thought she was slowing down. I was wrong.
Everyone told me that it was not my fault, and they were right.
Believe me, it's not your fault........you just did not know. Live and learn, right?

Again, I am sorry for your loss. Hang in there.

Aslo: recently when my other kitty was sick, I found a web site that had a list of different syptoms and what they could possibly be a sign of. I'll see if I can find it again, and post the link.