Earlier quoted context omitted.
I've done pretty much everything I could imagine to try to identify the root cause, no doctor could give a reasonable diagnosis. My tinnitus started after a night with earplugs, but it could have been a coincidence since I also used noise-cancelled Sony headphones. Who knows ¯\_(ツ)_/¯
Not to be rude but you ascribing an equal likelihood of causing tinnitus to one night of using earplugs(which BLOCK sound from your ears) vs presumably regular/sustained use of noise cancelling headphones(which BLAST sound into your ears) borders on ridiculousness and make me think you're just trolling..
After trying earplugs myself a few months ago, I decided it was too risky to sleep with them due to the pressure I felt in my ear (the one against the pillow) when I lay on my side.