While I don't have a solution I can sort of relate. My ET is hands only and usually not anxiety/stress related, but my friend has ET of the head and it is indeed very stress related. So I know when she is really stressed. Mine gets better with Xanax BUT I take it for anxiety and would not take it JUST for ET.

There are other meds for it, but I have no idea if they work or not. Most people I know with ET have chosen not to treat it.