I also have Eustachian tube problems.
It's possible that they accentuate the (pain) hyperacusis by aggravating the contraction of the tensor tympani muscle. They are also linked to the jaw muscles and the tensor palate muscle, which, if contracted too much, can affect the Eustachian tubes.
But the opposite effect can also occur. Sound trauma that causes dysfunction of the tensor tympani muscle then affects the Eustachian tube mechanism.
@Brian Newman, have you tried Rimegepant? As it works by blocking CGRP (migraine-pain) receptors, perhaps it might help. By the way, do you also have tinnitus that reacts to movement/contraction of your jaw and neck muscles?