I agree. Does he know about your issues? If so, i t hink a gentle reminder, with an explanation that you arent just trying to be snarky about his music(because thats not the intention your trying to convey), that you are so glad he loves music, and such could go a long way.

Perhaps you could watch a movie with headphones during short practises? Or would this too be triggering for you? Just trying to brainstorm here.