If he were a human he wouldnt want you to be sooo desperately upset. I know this is hard because when my dog died I was distraught too. It may help if you were to put together a little album of him so you can remember the good times you had together. (I dont know just a suggestion). This way you can fondly remember how things were & help you move forward but obviously never forget..
Its sad times like this that you feel that you need to be doing something, so maybe this is something you can do ?
Big Hugs xx