What a cool dog! I know your pain is so deep and raw right now, it's hard to fathom life ever getting better. But Avabear is right, time will heal, even though it doesn't seem like it right now. I can offer a few things I know have helped me and others when in such a place. No guarantees as everyone is different, but maybe can get you on the road to getting gas and groceries as a first step.
Getting onto this forum seems to be a wonderful help to many, including me, I hope it is for you. There are so many kind and understanding people here and in the world. Go to them, talk to them, cry with them. Trust yourself, do whatever you need to do, understand that everyone's different so your way may not be someone else's way. Feel your emotions as awful as they are, whatever they are, it's part of the healing process. I have joined a few grief groups and called a few hotlines since I lost my Ernie last Friday. It has helped. Be kind to yourself and each other, and to Waylon. Take care of yourself and each other, and Waylon. Ask for care when you need it. Try to get some sleep and to eat -- very hard, I know -- but take care of you so you can help each other and Wrangler's brother. Please try not to second-guess your euthanasia decision, it's probably the best thing you could have done given the prognosis and you made the choice out of your great love for him. Sometimes we make choices to try and save our critters more for us than them. I think you were right to understand he would not want to live that way. When you are able, send us some stories about your boys. No doubt Wrangler was a mighty spirit. He still loves you very, very much. Love never dies.
Ernie in the Sky, With Diamonds