I'm so sorry to hear that *hug*
Here in Canada, we now have the ability to apply even if death is not imminent, but it's harder in this case because a specialist in particular (not just any other physician) has to support the euthanasia as well. That's going to be my biggest barrier, because there are no specialists when it comes to noxacusis... the vast majority of doctors haven't even heard about it & what they know about hyperacusis centres on central gain, CBT, & sound therapy (which as you may know can drastically worsen someone, especially if they have noxacusis). But I'm going to do my best, & keep trying if need be. I don't believe anyone should have to suffer against their will. I would fight if it were just the tinnitus and I had some relatively mild sound sensitivity, or at least if my living & life situation were different, but the way things stand, it just doesn't make sense.
I sincerely hope you find some relief, one way or another. I so wish I could take away the suffering of all of us here. Sending much love & support!