@sshlpt In my opinion, your audiologist is right. Sudden hearing loss can be corrected but there is a small window, about 5 days from onset, when steroids help. The positive news is that a cochlear implant may get your hearing back. I don't know if hearing will return on its own once we have sudden hearing loss. I had loss of taste and smell at one time (well before covid) but those functions slowly returned after about a year. I did not have an injury. An MRI revealed no abnormalities.
Your tinnitus is interesting since it's in the opposite ear. There is no cure for tinnitus but some folks find that a hearing aid or cochlear implant causes the symptoms to disappear. Not sure in your case since the amplification will be on the opposite ear.
I hope you find relief and would be interested in hearing a follow up.
Tony in Michigan