Add the following to your diet: brewer's yeast, vitamin A, vitamin E, vitamins B-6 and B-12.
Delete the following from your diet: folic acid, iron, excessive amounts of vitamins A, E, B-6 and B-12.
Get a white-noise generator, or leave the tractor motor running (your choice on how to address Globular Wormering and the economy).
Get a hobby. Stop obsessing over it. Take antidepressants and antipsychotics.
Drive an ice pick through your eardums.
Prescription hearing aids greatly improved the condition - the ringing and buzzing was orders of magnitude clearer and louder than without the hearing aids.
Personally, since the constant background noise is just that, I remind folks that I am blind in both ears and deaf in one eye, so they will need to repeat themselves over and over again until I can understand what they are saying. After about x attempts they give up and go looking for some paper to write on. That allows me to go slapping all my pockets to look for my reading glasses, as well as taking their glasses off their head to see if they work.
On the other hand, I am often accused of shouting at people. I am not shouting - I just need to speak loudly enough to hear what I am saying. When the voice goes I'm legally changing my name to "Tommy".
stay safe.