Anybody experienced the same? Or had the same surgery?

I have been experiencing tinnitus with hearing loss since this year, and had an ear infection last year (first time I ever experienced.)

Now I went to ENT and had a temporal bone CT scan. Here are the results. My ENT recommended to have a mastoidectomy since she said antibiotics won’t cure this. She said 90% chance of improving hearing loss but it can also stay the same or worsen.

Anybody has the same experience? Could you please tell me if your hearing/tinnitus improved or worsen?

Findings:
Fluid is seen in the left middle ear.
Fluid is also seen within the left mastoid air cells.
The petrous pyramids are normally developed and symmetrical with smooth intact cortical margins and normal trabecular structure.
The internal auditory canals are sharply defined and with normal shape and diameter.
The cochlea and semicircular canals appear normal. No areas of sclerosis or dehiscence.
The right mastoid air cells are normally developed, clear and pneumatized.
The right tympanic cavity is unremarkable.
The auditory ossicles are normal in shape and position.
The configuration of the cerebellopontine angle area on each side is normal with clear delineation of the cerebellopontine angle cistern.
The external auditory canals are unremarkable. No osseous extrusions.
The carotid canals are unremarkable, are not aberrant and are not laterally placed

The left jugular bulb is high-riding but not dehiscent
The visualized portions of the brain are normal.
The rest of the visualized osseous and soft tissue structures are unremarkable.
Impression:
Left otitis media.
Left mastoiditis.