I am sorry for your loss, Liquide.
You did the best thing for him you possibly could - he passed away getting comfort from you. (As my wife has said before, "still doesn't stop my OWN heart from getting ripped out, though!") She no longer goes to the vet if an animal needs to pass on.
My condolances, and my hopes that the rest of your Holiday season will be much happier than right now.