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Well, it sounds like you have fasciculations- which are local involuntary muscle twitching. These can be caused by MANY different things:
Diet deficiencyDrug overdose (caffeine)Drug side effect (such as from diuretics, corticosteroids, or estrogens)ExerciseBenign twitches- usually affects eyelid, calf and thumb- triggered by stress or anxietyHeat exhaustionElectrolyte abnormalities (calcium and potassium)
Nervous system conditions that can cause muscle twitching:
Amyotrophic lateral sclerosis (ALS - Lou Gehrig's disease)Damage to the nerve that leads to a muscleMuscular dystrophySpinal muscular atrophyWeak muscles (myopathy)
Treatment depends on the cause. BUt this is really more likely to be related to stress. I would keep an eye on it. If it gets worse, you may need to see a neurologist
I hope that this helped. please leave positive feedback for my time and expertise :-)