I have had exactly the same even symptoms, even down to what your blood work was and supplements, although I take a couple more, I am a nutritionist. I’ve been to the neuro worst day of my life, same tests as you and spiralled into anxiety and despair. Very hard to climb out of the hole when you get there. I had significant stress before I started noticing the twitching with a bout of Covid preceding it. The whole thing has been hideous but trying to keep moving forward !!