I understand how you feel. At least you knew your dog was going to go and could say a proper goodbye. I literally left her at home in the morning full of life and was even playing with me before I left. When I came home in the evening and my other dog came and greeted me, he was pulling me by the leg of my pants. When I got to her kennel and she was unresponsive. I knew she was dead but I immediately called my vet, put her in my car and brought her to the vet where she confirmed Lassie was dead but based on her test she couldn't figure out what was the cause. It was during subsequent we found out what really killed her. My other dog was so depressed and he kept putting his head on me trying to comfort me or rather, we were comforting each other.
That's good advice and thanks man. Was it a pet or a family member that you lost?