When i clench my toes on my right foot it starts to shake and it just started today any help?

Fasciculations: Muscle twitching can have many causes, some benign like fatigue, anxiety, dehydration, electrolyte imbalances, thyroid problems, nerve injuries, and some severe like stroke, encephalitis, meningitis, Lou Gehrigs disease (ALS), multiple sclerosis (MS). See your Dr for a full workup so that any serious problems can be identified and treated.