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Hello. Thanks for the question.
I would get him to a vet as soon as you can. If he is walking in circles, tremoring and barking, then I would worry he has suffered some head trauma and brain swelling. Essentially, he has a concussion.
In dogs, we treat with something called Mannitol to bring the swelling down around the brain. I also like to use anti-inflammatory meds and pain meds to keep them comfortable. Many dogs have a complete recovery, but it can take days to weeks before they are completely back to normal. Most end up taking 2-3 days in the hospital before going home.
I hope this helps, let me know if you have any other questions.