Thanks for writing to H.C.M. for your query.
I have gone through your query bregarding accidental trauma over ear by slap two days back. As you are telling that you feel alteration of sound in hearing this indicates most probably you are having traumatic perforation of ear drum as this is very common on slap injury
These type of perforations are usually heal by it self or by conservative treatment only because our tympanic membrain has tremendous power of regeneration. You yourself is telling that you feel better today as compare to yesterday, this indicates exillent regenerating power of ear drum.
In such cases NEVER USE ANY EAR DROP
. because use of ear drop may hinder the healing process.
You can take antibiotic, anti histaminic and decongestants and it will be better to consult an ENT doctor as an expert medical advice