Take tmpffisch's advice, if it's not already too late. S/He's working in one of the industries where hearing loss is an occupational hazard. I've known several techies in that line of work who have had to find other employment as they could no longer subjectively balance an audio mix. Not a good way to finish a career.
I have an audio test about every couple of years and my hearing is almost as sensitive as it should be for a 25 year old, with the exception that the response rolls off at about 15kHz. Hardly surprising given my age. Apart from that, my audiologist has complimented me on maintaining my hearing, adding that, sadly, a lot of 30 year olds would envy me.
I like hearing the 'dawn chorus' and the occasional passing Merlin or pair of P&Ws.
Protect your hearing and seek professional advice ASAP if you suspect any hearing loss or are getting a ringing in your ear/s. That the best advice I can give.
As 2close said "Once it's gone that's it, it's gone." That means: forever.
Le Vieux