Yes, the twitches do sometimes stop. But honestly, during my first bout with it, they didn't truly stop for seven or eight months.
There is not perfect correlation, but for me, in general, lower anxiety over time = fewer twitches.
In my experience, looking for the underlying cause, or thinking about what could be causing it, has been nothing but anxiety fodder. Autoimmune response, dehydration, mineral deficiencies, "excessive" exercise ... After going down all those roads in my mind, I've determined that for me, seeking the "underlying cause" is a version of reassurance-seeking which does not allay, but instead feeds anxiety. I just need to accept, and continue to accept, that I have anxiety, which causes REAL physical symptoms.
And yes -- I too have created symptoms with my mind. Entirely possible. And I am a very logical person.