I'd been considering asking my doctor about this but I figure it's not going to make much of a difference at this point. I have ADHD and got my hearing tested a few years ago because I was concerned about how often I couldn't understand what people were saying.
Nope, my hearing is perfect. My brain just has a hard time decoding sounds sometimes I guess. A lot of times people sound like they're mumbling. I've started telling people that I'm hard of hearing and asked them to speak a bit louder, slower, and more clearly. Makes a big difference!
Single game would be Skyrim, series would be Pokemon or Harvest Moon. I haven't put a significant amount of time into a game or series in a loooooong time :/