My sympathies, friend.
I put down my 15 year old Golden Retriever, "Dugan," more than 10 years ago, and I think of him every single day. At least I have 15 years worth of memories.
Think about Mozart every day. It will help. After a while, the memories will stop being painful and become golden.
And I looked, and behold a pale horse: and his name that sat on him was Death, and Hell followed with him. And power was given unto them over the fourth part of the earth, to kill with sword, and with hunger, and with death, and with the beasts of the earth.