'Essential tremor (ET) is a nerve disorder characterized by uncontrollable shaking, or "tremors," in different parts and on different sides of the body. Areas affected often include the hands, arms, head, larynx (voice box), tongue, and chin. Rarely, the lower body is affected.' (Web MD 20011)
Just for your answerers who don't know....I have seen this type of tremor before in people who have just come out of a trauma-induced state of shock. That probably means the same area of the brain is getting some neural activity, but that's as far as my knowledge goes. I will be keeping my eyes and ears open for information though, lovely lady!