I don't know whether I'm actually starting to suffer hearing loss or my brain is just not processing certain frequencies correctly.  I'll explain my situation and see if anybody here can relate. I'm 66 years old. Last Sunday I was driving over to my local gym for a workout.  About half way there I started to hear a rubbing sound predominantly on the left side (which is the driver's side for USA drivers).  My first thought was maybe my brakes were starting to go, so as I have an appointment