I have experienced symptoms just like the ones you describe. Been through all the same testing with the same results. Checked out a sit ISH2 recommended to me. aboutbfs.com check it out. Lots of people out there just like you and me. Very informative.
Good luck
Fasciculations or twitching in the absence of testable/constant muscle weakness or muscle wasting, especially over time, is unlikely to be ALS. With your normal EMGs this makes it more unlikely, and if testing with the neurological exam or EMG in the next few months is normal then it is even more unlikely
I cannot tell you for sure without examining you myself
Benign fasciculations (as in BFS) tend to be more widespread, and can increase with exercise.
Apart from your desk job, did you regularly maintain your fitness? - even not exercising for a few months can make one unfit and more likely to experience muscle aches and pains. Try to maintain a regular exercise and stretching program (keeping in mind that fasciculations may increase with exercise) and watch for results within a few weeks
Good luck
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