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Muscles Tremble (eccentric muscle contraction)

I am a 36 year old male with no other conditions/diseases. Muscles in my entire body have been shaky. They mostly shake when I’m doing the opposite of a muscle movement (eccentric muscle contraction). For example if I raise my hands up in the air when I lower them down slowly my shoulder muscles will tremble. This happens to every body part my legs calves arms, etc. Anytime I sit up or lay down I feel my abdomen shake. The trembling feels like when you’re muscles shake because of strenuous exercise however, this now happens to me at any time, no matter the time of day or what I’m doing.

I am very active and the shaking usually doesn’t bother me when I do cardio or strength training, but I can feel it in every exercise in the negative portion of every movement.

I have seen a Neurologist and Gastroenterologist and have had many labs and imaging including labs for thyroids, calcium, creatinine, magnesium levels, hepatitis, cirrhosis, inflammatory diseases etc. I’ve had abdominal ct scans, ultrasounds and mri as well as a brain mri. I’ve also had an EMG checking for ALS, colonoscopy and upper endoscopy.
My only abnormal labs were slightly elevated unconjugated bilirubin and slightly elevated alkaline phosphtase.
My doctor said I probably have Gilberts Syndrome (high bilirubin) but I’m not convinced.

My neurologists have tried a magnesium supplement, and increasing hydration and electrolytes and now they’re are not sure what to do next.

Any suggestions/support would help! Thank you.
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Any update on your symptoms or a diagnosis? I've been down the same path with no answers and persisting symptoms.
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