Sorry, I did not see that you had an MRI. Regular MRIs without contrast will not show a
Vestibular Schwannoma.
My father had similar complaints as you've posted. He ended up going completely deaf in one ear. Finally the ENT requested a brain MRI with contrast and he was diagnosed with a Vestibular Schwannoma. He was able to have gamaknife surgery in Orlando, and not he's fine. He still can't hear in his left ear, but he no other issues. I'm not saying you have this, but an MRI with contrast might be a good idea to rule it out. My father is 66 years old.