There are medications you can try, but his doctor didn't think they'd help much. There's a line in this reference that made me laugh:
All people have some degree of tremor during movement. This shaking normally involves mainly the hands. Stress, fatigue, anger, fear, caffeine, and cigarettes may temporarily worsen this type of tremor.He has not one, not two, but Every Single One of those risk factors! Sigh.
Oh they left stubbornness out of the list. That should be the first one.