That sure doesn't sound like listening fatigue to me. Definitely get it checked out...
Now... in my university days, my favorite local band (FM) was playing just down the road (at the Gasworks, for anyone in TO) and we used to hang out every evening in front of a big Altec horn tweeter (with neatly printed graffiti on the diffraction lens) drinking beer and doing our homework.
If I remember correctly, that was the stack handling the MiniMoog, Elka String Synth, and Nash's electric mandolin. I remember going over to the sound guy a couple of times and asking him to drop the levels a bit because "our" amp was clipping on the loud parts.
Four hours of THAT every night... NOW you're talking listening fatigue
