I'm truly sorry, from the bottom of my heart. With all of my suffering, I have been extremely fortunate in that my loved ones have treated me right. I'm sure there are family members out there who completely don't get it at all. But they are not at the forefront of any discussions or anything.
We have had disagreements, but they are completely expected ones. For example, could I be in a better position by taking off my earmuffs and doing sound therapy? Am I over protecting too much? However, after I explain that TRT completely lacks evidence and that all personal evidence says that sounds make me worse, I am believed. They certainly understand that I have a disease and that sound therapy can't fix this.
To be honest, I pin all of these communication issues on the ATA, ENTs, and the Jastreboff movement. If one of my loved ones developed hyperacusis (and I never had it before), I would do some google searches and see all of the "credible" sources talking about TRT and overprotection. Given that I care about my loved ones, I would want to see them better. I'm sure I would wonder about over protection as well. It's simply astonishing that the Jastreboff pseudoscience is propped up as mainstream advice. In 2020.
I, and others, can't emphasize enough how much harm is being done by outdated advice. Getting an MRI, which every doctor has recommended for me, is not a trivial decision. In fact, if it is trivial, it's in the direction of not doing it, given that 40 dB music set me way back for 6 months and I still haven't recovered from it. Anyways, I won't start that rant.
What's especially sad is how common it is for family members to not believe people. It's almost so common that I expect it to be the case. I really feel for you.