I can't tell you how very sorry I am for your loss. Wish there was something I could say to heal or at least numb the pain.
Not to take away from your awful loss, but I can relate. A few months ago our supposed Aussie was healthy. Hubby woke one morning and said she was doing awful. We took her to the Vet and never got to see her again. It too was a horrible, total surprise.
I know this won't help, but I wanted to share this with others.