BBL, you'll get through it, you'll recover from the pain. It's supposed to hurt. It has to be painful. If you didn't hurt or feel sad, it would mean you didn't really love him or didn't really care. And there are people out there like that, but you're not one of them. It hurts because Duke was that important to you, he was that special, and he left that much of a positive impact on your life. That's a huge achievement for him. Just try. Try your hardest to feel proud and fortunate to have had that and experienced all of that. I know it's hard, and the loss is still fresh since it's only been 2 days. But, in my opinion, you don't need to distract your mind or try to forget him. That would be doing him a disservice.
From the pictures, Duke was a big boy, and probably a sweetheart to you and your family. But, he was a German Shepherd, the apex of the dog world. He was full alpha, and I'm sure he was ready to give his life for your safety if he needed to. I feel like he would want you to absorb as much of his kick-ass strength as you could, and keep going in life. Whether it's humans or dogs, most living things who love us, want us to be happy. I'm sure that making you happy was his primary goal every day. I'm sure he's sad he can't keep doing it right now. And I'm sure, wherever he is, he wants your life to be happy. His memory making you sad would be the very last thing he would want.
I'll share this with you. It's been 4 years since mine passed. I still have her toy box, full of toys, in the same spot it's always been. I still have her food bowls in the kitchen. Sometimes, I still drop a chicken nugg or a hotdog in there if I'm eating it. It's what I would do if she was here, so why not. I don't know if that's mentally healthy. I don't know if your family will hate me for sharing that, and you end up doing it too and hoarding Duke's belongings
but I find it comforting.
You need to eat. You don't have to enjoy it. But, please eat. If you're not around to remember and honor Duke's life, who will? Do it for your boy. <3