Welcome in H.C.M.
I have gone through your query regarding ear infection
As you said that you have middle ear infection and for this you have taken antibiotic which has cleared up infection but tinnitus is still persisting.
In this connection I would like to tell that as you said your doctor has told that your ear drum has retraction pocket , this indicates that you have dysfunction of Eustachian tube. To treat this you should take - Antibiotics, Anti inflammatory, Decongestant and steam inhalation.
I hope above treatment will help you.