From reading some of the above...
Loud Gigs, Riding Bikes and Wind Roar, I now where foam plugs... and more recently Music mostly via Headphones...
I get a more a low freq boom type resonance... than a high pitch ringing or buzzing or hissing. I wear earplugs to sleep although you can hear the sounds within your head, air and fluid etc, ticking clocks, central heating coming on, idleing cars, a fan, snoring wife... anything like that drives me mad!
Recent change in headphones has shown a reduced volume in my left ear, even swapping the headphones round.
Tried a few on line hearing and headphone freq tests, This thread has now prompted me now over 50 to book a free hearing test st specsavers, just to see (or hear!)