Mine was really bad for a while, then went away for a few months, and then came back. I deal with it now but it's not as severe, yet still annoying sometimes.
Sounds like beeping Morse code. I get it from fridge sounds, A/C, rubbing, water, stuff like that. When it's bad I hear it off everything. It's definitely improved. It was horrible last year. My noxacusis is the issue now.