I was prescribed propranolol (beta blocker) at one time to help with anxiety. It is often used by musicians and actors to curb stage fright
. It has something to do with adrenaline receptors, and apart from lowering blood pressure I think it curbs the effects of adrenaline, which is what causes tremor in anxiety.
Unfortunatly I have been taken off that as my GP did not like it as a long term solution to anxiety and now I am on lorazepam instead, and no that doesn't stop the tremors.