Thanks for your query.
It is unfortunate that someone slapped your ear. Ear is a sensitive place to slap and you should avoid such events in future.
You should get a check up from an ENT specialist
immediately.A blow to ear can injure the organ in many ways.The tympanic membrane may rupture. The ossicles
may get dislodged. And there might be other injuries.So checking the ear is needed both clinically and by different investigations.
Its really hard to say when will it get to normal hearing level or will it atall return to normal condition without intervention before examining your ear, so get a medical check up.
Hope this helps.
Update here how you stay.
Disclaimer: The Expert’s advice is provided for general informational purposes only and SHOULD NOT be relied upon as a substitute for sound professional medical advice
, as a complete assessment of an individual has not taken place.Please consult your nearest physician before acting on it. The advice is not valid for medico-legal purposes also.