It is hard to tell from what you've described. It could have been a hypoglycemic episode. The symptoms are very common in hypoglycemic episode. It could have been a seizure. I had an epileptic dog and when he had seizures, that is what it was like. It could be caused by something else. Once the bloodwork comes back, hopefully you'll get an answer.
Sorry he didn't feel good! Is he back to himself now?
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