I've cried myself dry many a time after losing my pets; dogs and cats. It's compounded by the fact that they are with us 24/7 so the void they leave in our lives and homes is immense. I know awful things are happening around the world, but this is happening to you now and it's your pain and you have every right to be hurting. At least you were with him at the end which I think is VERY important and, strangely enough will help the healing process. We also, with pets, have to make every decision for them, and I've often tormented myself with feeling that I've got it wrong sometimes. My pony died in my arms several years ago, and I can't even think about it and very rarely go to the field where she died. I still miss her terribly.