Please try not to use headphones. I think there is a chance you can heal at least some, with time. Or you can habituate at least to some level, if not fully. i'm rooting for you.
Listen to @TheDanishGirl. Headphones will only make it worse. And from my own experience, I can tell you that tinnitus can reduce in intensity after some time. FWIW, I also have a hum (since 2016) and two other tinnitus sounds.