Wow, this is really interesting.
I have had issues with hearing since I was 18. I found the world was too noisy and I had to retreat. I became quite reclusive, but I was happy about it. Being surrounded by people talking about nothing really started to get to me, and I prefer the quiet.
In my early twenties I had real issues with over active wax in my ears, and I tried everything, but nothing would help. I actually concluded it was my body protecting me from the noise of the world. It started to get scary in my late twenties though, when I lost hearing in one ear all together, and could barely hear out of the other. This lasted a few months, and no amount of syringing seemed to help.
Eventually it did, and I got my hearing back. I then discovered that my grandmother had the same issue. I had no idea over active wax glands in the ear were a genetic trait!
I never considered that it might be linked to PTSD. I used to have terrible trouble discerning what people were talking about when they spoke to me...but not from hearing troubles, more that I just didn't seem to be able to take it all in or process it.