Please help me find an authoritative neuro/immune explanation for noise sensitivity which will convince my parents to be more careful around me.
Have you tried any of the supplements in Hip's thread: Five ways to reduce your ME/CFS wired but tired hyperaroused brain state?
There is an interesting explanation in this article about how people with ME can be shifted toward a lower seizure threshold which causes neurons to become overexcitable. If they fire too much they eventually die. If this is what's happening to you then prolonged excess noise might lead to brain damage (that's my opinion as I understand Dr. Cheney's explanation of what's happening to neurons; this isn't medical advice).