I feel like a bad mom!

I took Charlee to the vet this morning because he's been itching since we brought him home. They gave me an antihistamine and a creme rinse in case he has dry skin or an allergy of some sort. Charlee isn't used to the car yet so he whined and screamed the whole way there and back. When I finally got home, I put him on the grass and he let out a piercing yelp. I think he got stung by a bee on his paw! Bad enough I tortured him by going in the car and to the vet and now this! He's walking fine on the paw and it doesn't seem swollen but he licks it and favors it now and then. Guess it was a good thing I got the antihistamine. He's sleeping now. Poor baby.