What if I am just imagining the high pitch sound in my mind whenever I hear about or think of tinnitus just like how someone tells you to imagine a whale and you form a mental image of a whale? I don’t pay attention to the noise while I’m busy doing stuff but once I think about it, it is as hard to stop noticing it similar to being told to breathe manually, and it gets very annoying after some time. Is it what tinnitus really is?
I don’t know, I guess you can make it up, but that noise could be caused by fatigue, stress or plain lack of good sleep, in my experience.
It’s possible that you need to rest a bit. I’d suggest trying to note if you hear that more often when you’re tired.
In other hand, my gf has tinnitus and she finds it hard to hear anything that’s quiet, like if the sound was actually there. Maybe that’s another thing you could test, but I don’t really know how it works.