Michelle, I too just recently had to put down my cat and can attest to how hard it is. But like you, I feel it was the best thing to do given his health issues. I think about him everyday. We got the individual cremation, which allows us to have a little box of his ashes. The box they gave us has a place to put a picture, which we did with one of the pictures we took of him being silly. For now, I've got the box up in a little shrine that I see everyday and it makes me smile to think about how me made me laugh so much.
I hope you and Corey will find some peace in knowing he's not in pain and in remembering the good times with the little guy.