Dog limping after running

I have an American bully who is 37 kg. We are trying to get his weight down through his diet. Yesterday he got super excited and ran after a frisbee a couple of times. Came back home panting. We thought it was the heat. He cooled down and slept on his bed. This morning he couldn’t climb onto my bed on his own and I saw he’s limping, both hind legs.
I have tried to ice the leg and given him a carodyl (weight appropriate as the vet here taught me) and he’s still unable to get himself up. It’s not been too long since the carodyl. He had thrown it out the first time. Now he’s panicked that he can’t get up from bed and do his usual routine.

What do I do?