SOOOO sorry about your buddy, T-Bone.
Like you, I'd lost many but never had to put one down until our first Yorkie. I completely understand how devastating that is.
But you know, the truth is you were the best friend to him that you could be. Making him suffer and keeping him around would be selfish and not good for any of you.
Now "your boy" as you always knew him is restored ... on the other side of the bridge.
Thoughts and prayers are with you.