That is very unfortunate and sounds like a pain in the a** to deal with. But I'm a little surprised that you say it's undiagnosed since it has such impact on your life. Someone in the medical field must have some knowlegde about this and offer something that can improve it, at least a little bit.
So, a job where you don't have to do repetitive tasks and avoid frequently using your hands. Most jobs like this would of course include talking, but if I remember correctly you have a bothersome hyperacusis. Only a few things comes to mind. I guess being a secretary or cashier at some place that has very few visitors/customers can fit. I recall some days when I was secretary at the hospital. Nothing really happened, maybe 5 patients checked in. I was literally paid to sit and drink coffee and stare out the window. A place where things are slow like this everyday, perhaps?
I don't know if it can count as a real job. Reviewing movies/texts or something similar at home then writing short articles/reviews for web-magazines or something.
Other than that maybe shorter hours?
These aren't really good suggestions and finding someone who's hiring for a suitable job is probably the hardest part.