I noticed it when I was a kid, long before I ever played in a band. Big amps, drums, and ESPECIALLY cymbals at ear level just made it worse, but for me, it wasn't actually caused by bands/loud music, they just made worse.
The band I am playing with at the moment has a drummer using one of those Roland electric drum kits, with rubber "cymbal" triggers - sacrilege to the purists, but much kinder to the ears of those sitting right next to them!
I too have seen specialists and audiologists, with no successful solutions other than being told to "get used to it".
Last year I tried a herbal supplement that was being pretty heavily pushed in Australia...I tried it every day for a month - no good.
Sadly, just the other day, my 4 year old daughter asked her mum "what is that high sound in my head?"
