Just over a year ago we lost the best cat ever, Buddy:
Maybe this sounds screwed up, but this was the biggest trauma I've ever been through, much worse than my grandparents dying. He lost most of his jaw to oral cancer but he coped with that fine, he ended up dying of a respiratory inflammation. He died right in front of me just after I got him to the vet's and the image is seared into my mind permanently. He only lived a short time after his cancer surgery, and I've not yet forgiven myself for putting him through that.
Now it's happening again....