Dang... I used to have some decent sites for this, but I don't remember where I've hidden them. Nothing all that helpful, really, though.
I've had some sudden drops in hearing that never corrected themselves, and the last couple of times I had a period where sound was really physically painful to my ears (one in particular), and where sounds got really distorted (like broken electronics at first, with some lingering pitch problems - things still sound lower than they are in one ear). Thankfully those parts mostly passed. Was enough to spur me into doing some research, though. Unfortunately it seems like yet another one of those things that most of the medical community doesn't understand at all yet. I do recall that a few people had success treating the hearing loss with aldosterone or anti-candida meds (which sounds like a potential ME/CFS connection to me).
I'm curious if anyone else has had an unexplained drop in hearing (seems very odd that it would be timed with the ME/CFS, equally weird, but not related), sound distortion, pitch distortion, or actual physical ear pain from sounds. It isn't something I've heard mentioned much in the common lists of symptoms, but I know we all have a lot of our own craziness. Would be nice to know if it isn't just me...