I just hit the top of my head on stainless steel at work and now the nerves in my face are jumping. what's this a symptom of?

Head injury: Hitting the top of the head can be jarring to the brain and the neck. It is difficult to comment on your description of 'nerves in my face are jumping'. Also, I don't know how hard was the blow or if you lost consciousness. You should seek medical attention to exclude a concussion or neck injury.

Head trauma. : Facial twitching is not an expected symptom from head trauma. It is most likely unrelated to the head trauma. If it continues seek physician evaluation. If you were knocked out, (lost consciousness) have vision changes, vomiting, are confused, or have a progressively worsening headache than you should seek immediate physician evaluation.