Hi and welcome to HCM!
Thanks for posting your query here.
Loss of consciousness
and a fit like episode after a fall definitely needs a medical advise. There are chances of internal haemorrage- bleeding in the brain if the fall is quite hard. Is there any history of seizures/fits
in the past, your age and health conditions will decide the diagnosis. Before a fit there are chances of aura-blurring of vision and headache, ringing sensation in the head. In a person with a first fit it will be difficult for him to recognize these things.
A general physical exam, routine blood check and if necessary a CT will help you in diagnosing the condition.
If all these are in normal limits it could be a just shock
as you said.
Hope this is helpful to you.