Oh man. I'm so sorry for your loss!
And yes, I lost many pets in the past and I still think about them and cry.
Yesterday I lost a betta fish that I teared up over. She lived to be close to 6 years old so had a good long life.
Not only that, with me being a dog groomer, clients dogs pass away and I try my best to be professional but at times I lose it and cry with them. ^_^;
You're in shock of what had happened, it's a normal experience. It'll take time to heal but just remember the good times you've had with your furry friend.
Again, sorry for the loss. :(