Hi,listening of ringing sounds is called
Tinnitus.
In your case ,it may be caused by hearing loud sounds or it may be due to
cold which causes Eustachian tube blockage(the tube which connects ear with nose and is responsible for equalization of ear pressure with the outside atmospheric pressure) or both.
For the treatment,you have to avoid listening to loud sounds in future.
Avoid cold food , Steam Inhalation,Oral Antihistaminics (like
Cetrizine),Nasal Decongestants(like
Otrivin nasal drops) if you are suffering from cold.
You can also get benefit from tablet
Betahistine.
Brahmri pranayam might also help if you are aware of how to do pranayam.
Hope this answers your question.Take care.