Good for you! Not easy. We've been giving our 17 year old Siamese cat Beeper subq twice a week since October, and it's keeping her kidneys (polycystic kidney disease) stable so far. She hates it, but it's quick. Sometimes they throw up after subq--our vet thinks it's because of some momentary vascular response to getting fluid--and that kind of throwing up is not something to worry about, she says. Anyway, the subq really does help.
"My predominant feeling is one of gratitude. I have loved and been loved;I have been given much and I have given something in return...Above all, I have been a sentient being, a thinking animal, on this beautiful planet, and that in itself has been an enormous privilege and an adventure." O. Sacks