The organization to check out is www.essentialtremor.org --that is the international organization.
I can only offer my best wishes. My tremor is not nearly so severe as yours, but I do wish that the public was better informed. I don't like the idea that they think it's d.t.s, too much caffeine, etc.
Our support group has given anecdotal stories about the medications, deep brain stimulation procedure, etc. (There are members that do have severe symptoms, some starting at an early age.)
Again, best of luck.