I would question A vet that says he never saw anything like that in the video. Chumley has head tremors and I absolutely freaked out when they started. My first vet wanted to run all kinds of tests but I got a 2nd opinion..a bulldog savvy doctor who eased my fears, advised me its quite common in bullies,says he has seen it dozens of times, and told me not to waste Money on expensive testing that will probably result in no further answers. A treat will instantly snap Chumley out of his tremors so I don't believe his are a blood sugar issue..they stop as he's chewing on the treat so he can be distracted out of it..that doesn't seem to be the case with what you're experiencing. Praying for you and hoping it all works out without you having to give up your precious little bully! Good luck.