This sounds like Idiopathic Head Tremors. View this thread, and watch the videos, there is ovideos in this topic with seizures and tremors, maybe you will be able to tell the difference? Let us know what you think it could be. The sugar should help, and I dont know if the vaccinations could cause it. I don't think they even know what causes them.
http://www.englishbulldognews.com/fo...c-Head-Tremors