Hi, thanks for your query.
I feel probably you have hearing nerve weakness because of previous infection. Hearing loss
suggests hearing nerve weakness.
As you have undergone 2 mastoid surgeries , there are more chances of inner ear
damage either because of infection, or drugs or surgery.
If I were your treating doctor I would advise for audio me try test, detect the degree of hearing loss and nerve weakness.
If hearing loss is moderate to severe, then I would advise for hearing aid
For tinnitus, I would suggest you to try with betahistine
16 mg tab + ginkobiloba
tablets + multivitamins for 3 weeks and see the response.
You can discuss my views with your doctor as well.
Hope my answer has helped you. Thanks.