Heather,
Don't feel too bad, I bet he was just exhausted from trying to get out of there. I am sure he will be fine.
It did remind me of an experience I had. Some co-workers decided to try and find a home for an adorable little kitten, they said he was too rambunctious. They said they were going to take him to the vet and have him neutered and declawed so they would have an easier time finding him a new home.
I felt bad for the little guy and I told them if they would just get him neutered, but not declawed, I would take him home to my other two cats. I thought having a kitten around would be cool.
So after the procedure and convalesence, the little boy comes to my house. Terror reigns! The first hour he was there, he crawled up on a shelf in the kitchen and somehow knocked it off of the wall and broke one of my favorite coffee cups. I cleaned up that mess. A short while later, he managed to get on the counter and break a plate. I cleaned that up.
Went to bed, a short time later, I hear this very loud CRASH downstairs. I ran downstairs to see what happened and it seems that the kitten and one of the older cats were playing around on the furniture and this resulted in one of the
very expensive antique 'John Jelliff' attributed chairs that we had just purchased earlier that same day was badly broken (as in unusable!)
This was the last straw for my ex. He took the kitten and threw him out the back door and told me "DO NOT let that cat back in the house and if it was still around in the morning, take it to work and give it back" to my co-worker.
I heard that poor kitten mewing for a while but I was afraid to open the door!
The next morning, I went to look for the poor thing and when I opened the back door, the little kitten was right there, trapped between the back door and the screen door all night!
I dutifully returned him to the previous owners.
To this day, they swear he is the best behaved cat they have ever owned