Thanks for writing to H.C.M. for your query.
I have gone through your query regarding ringing sound n your ear in niht hours, his happens in the ear which was exposed to trauma by slapping. You are been examined by an ENT doctor and getting treatment .
here I would like to tell you that such type of unanted sounds are labelled as TINNITUS
. There are so many causes of this tinnitus and traumatic swelling and congestion of ear drum also one of them. You are having tinnitus due to slap this will be cured in 8 to 10 days and during this period you have to do-
(a) Keep your ear clean and dry.
(b) Don't put any ear drop
(c) Take steam inhalation.
I hope this will help you.