It sounds like you are suffering from a form of myokymia. This is very common during times of stress like you are experiencing at work
This is nothing to be worried about. Please allow me to explain:
The most likely cause of your symptoms is called myokymia. Myokymia is an involuntary, local twitching of a few muscle fibers in the body of a muscle. This twitching, if it occurs in a limb, is not strong enough to actually move a joint but can be felt and sometimes seen as an area of quivering.
Myokymia commonly involves the eyelids and muscles around the orbit. It often appears and resolves for no apparent reason and has not been linked to any underlying significant pathology. What causes myokymia? Studies have shown that it is associated with anxiety, stress, lack of good sleep, high caffeine intake and the use of some drugs.
The best way to treat myokymia is to get more sleep, decrease caffeine intake and decrease stress. The good news is that myokymia is not a sign of serious underlying pathology and often resolves on its own.
Here is an excellent article on this topic:
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Dr. Rick MD FACS