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This is Dr. David
99.99% of all benign twitching is due to benign fasciculations which will not lead to ALS or MS
severe anxiety can cause you to have benign fasciculation twitching of your nerves.
dehydration, lack of sleep, muscle fatigue, low potassium, or low magnesium levels can cause it as well.
you could also have a pinched nerve in your neck or cervical spine which can cause twitching and fasciculations as well.
make sure you drink plenty of water and fluids after your spinal tap
and try to lay down and get some sleep to recover.
let me know if you have questions.