Losing a cat like that is rough, I had that happen to a cat we had when I was in high school, but it was limping home outside dragging it's legs. :(
Dodged vet bills though since I lived in the country.
Ive heard some motivating speakers say to Try to stay positive and list all the good things happening. (Easy to say on this side of the fence), but negative things build on negative things, and posivity will build on itself as well.
Thanks man. At this point, it could've been a goldfish and I'd still be looking up and wondering why this crap keeps happening. My vet bills weren't small, but nothing close to what they could've been if I was stubborn to try to pursue all of the treatment options despite their minimal success.