No, I didn't bother reading most of the posts.

Dopamine has nothing to do with essential tremor, based on the evidence.
In fact, it's mostly due to caffeine use, anti-depressants or low blood sugar and a couple of other things.
At least it is worsened by those things, I'm sure it would be unnoticeable without them, in most people.

Just because some illnesses have the same symptoms, does NOT mean they have the same cause.
Plus dopamine being involved in Parkinson's is not conclusive by any means.