I've always had tinnitus, but it used to be that I could only hear it in absolute silence, but it was a medication that triggered mine to go from barely there to screaming banshees in my ears 24x7x365. It sucks to know that I will never truly experience silence again, but my brain does tune it out most of the time. But it's mostly noticeable at night. Mostly.

I think I got it.

I also recall the days before I listening to music a lot with earplugs at rather high volume, like, 6/7 hours per day multiple days.

That's the only out-of-the-ordinary thing I did leading to it, it might be related or completely unrelated, who knows.