I had lots of problems with jaw fatigue, chewing, twitching in my neck, it was all related to anxiety. It can play lots of tricks on you. Never underestimate the power of your mind to manufacture symptoms. You should put your mind at ease. Especially with a clean EMG. There is evidence that bulbar ALS will show on the limb EMG and if yours was clean, you should be reassured.
Here's a quote for you:
EMGs AND DIAGNOSIS
From "Ask the Experts," on the MDA Forum on CompuServe. "GO MDA."
Q. I would like to know if EMGs (electromyograms) done on the limbs of the body can detect a bulbar onset of ALS (early appearance of symptoms in the throat and mouth muscles). If not, what test can and should be done to check for a bulbar onset? Also, how important is a muscle biopsy in the detection of ALS if EMGs appear normal?
A. From Dr. Robert McMichael, MDA clinic director, Ft. Worth, Texas: If the limb EMG is characteristically abnormal, it helps establish the diagnosis of bulbar-onset ALS. A tongue EMG, if abnormal, strongly supports the diagnosis, if alternate diagnoses such as brainstem lesions are excluded.
A. From Dr. Mark B. Bromberg, MDA clinic director, University of Utah, Salt Lake City: In making the diagnosis of ALS, the site of onset is less important than the distribution of lower and upper motor neuron damage. The EMG is a sensitive technique for detecting lower motor neuron damage in body regions that are not yet weak. Thus, abnormalities in the EMG can be used to help make the diagnosis of ALS early on when there is only weakness of bulbar muscles.
One advantage of the EMG is that it can be applied to a number of different muscles and is far less invasive than a muscle biopsy. If an alternative diagnosis is in question, sometimes a muscle biopsy can provide specific information.
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Thus, abnormalities in the EMG can be used to help make the diagnosis of ALS early on when there is only weakness of bulbar muscles.
YOUR CLEAN EMG SHOULD BE REASSURING IN THIS CONTEXT

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