I had the exact same experience ..Around 3 weeks after the second Moderna shot . Audiologists could not do anything but prescribe hearing aids to alleviate some of the symptoms. My GP told me that some of his patients experienced partial deafness and/or Bell's Palsy symptoms ..My wife got tinnitus from the COVID vaccine. Out of the blue last year she developed tinnitus. Went to see doctors, they couldn't figure out what caused it. They thought maybe an infection, etc. Gave her some steroids. Didn't help.
Then I got a news feed about "Vaccine induced tinnitus". I asked her when her tinnitus started and sure enough it was right after getting the vaccine.