As an experienced semi-retired school Band and Orchestra Director, I was disappointed to recently discover the hearing in my right ear is seriously diminished by a "schwannoma (sp?)," on my eardrum. ENT said it cannot be removed by surgery. Since I now direct a New Horizons Band (www.newhorizonsmusic.org), it is quite vexing. During Covid-19 I bought hearing aids at Costco without much improvement. After learning that most Audiologists have little or no training for working with musicians, I contacted "Sensaphonic" in Chicago to locate an Audiologist in my state (NC). I've contacted her office but have not yet had an appointment.
There is an organization named Association of Adult Musicians with Hearing Loss (AAMHL). Their website has a great deal of valuable information, including testimonials for some of their members. I've found it quite useful and informative.