Has anyone had severe nonstop ringing in ears after COVID?

I’m posting on behalf of someone very close to me, Maurice, who has been dealing with severe and persistent health problems following COVID.

His condition has significantly affected his quality of life, and despite seeing multiple doctors, specialists, undergoing extensive testing, and trying different approaches, we still have not been able to find an effective treatment or a clear explanation for why his symptoms have continued.

Some of his symptoms are extremely intense and persistent, particularly neurological and balance-related symptoms, along with other physical symptoms that began or became significantly worse after COVID. At times, the severity has been overwhelming and has made normal daily life very difficult.

We are now trying to connect with other people who may have experienced a similar post-COVID condition.

Has anyone here experienced severe, persistent neurological or vestibular symptoms after COVID that lasted for years? If so, were you eventually able to identify what was causing them or find a treatment that significantly improved your symptoms?

We would especially appreciate hearing about specialists, Long COVID programs, testing, medications, or other treatments that genuinely helped you.

Even if your symptoms were not exactly the same, I would be very grateful to hear about your experience and what finally made a difference for you.

Thank you so much to anyone willing to share.