I just wanted to pop in and make a post to clear some things up. I'm in my second year in a doctoral program of Audiology here and I see some things on here that people have said that just don't make sense.
As far as I know, there is no connection between EDS/HMS and otosclerosis. Otosclerosis by itself is pretty common, though, and there's really no way to confuse it with joint hypermobility in the ossicular chain of the middle ear on a hearing test. And again, I have never seen evidence of the link between hyperacusis and HMS, but I can see how it could happen with the anatomy of the ear. A true cochlear loss and HMS have no connection, though. I can see nothing that would link them at all. That said, some hearing loss is quite common, and I think us being in tune with our bodies so well has let us notice hearing loss sooner than most people.
Tinnitus... oh where to start. Scientists haven't the slightest idea what causes it, but they are getting close to a treatment that will help some people. It is most often associated with people with hearing loss, but you can have it with no hearing loss present. I've noticed that people with normal hearing and tinnitus often have a parent with tinnitus, too. Genetic component? Maybe.
On to middle ear issues! Eustachian tube dysfunction is what it seems like a lot of people have been complaining of. The fullness and inability to "pop" their ears. I definitely think this can be linked to HMS, as I have it myself. I either get stuck with negative pressure in my ear and reduced hearing (which you definitely CAN hear) or with an open tube, where you can hear yourself breathing. I also have horrible sinus problems, which are the root of the issue.
I've seen a lot of people saying that they can't hear well in background noise... I don't want to burst bubbles, but that's really normal. You're reducing your signal to noise ratio (or how loud your signal is compared to the background noise), and that's going to make it a lot harder to hear for anyone. So here's one thing you can say is normal! That said, I think auditory processing disorders are highly underdiagnosed and often written off as ADHD.
Seems the audiology system in the UK is extremely different than here, which really makes me sad. So I hope those of you that need hearing or balance help can find a good audiologist to help you. Finding someone with a membership in a professional organization really helps. Anywho, I'll hop off my soapbox now! Hope I could explain some things