I've had severe tinnitus for over a decade, and know exactly what you're talking about. It's not just an audio tone, but I very much get these "pressure" feelin

I've had severe tinnitus for over a decade, and know exactly what you're talking about. It's not just an audio tone, but I very much get these "pressure" feelings inside my skull that line up with the audio tone getting louder at times (the perceived volume of my tinnitus tone gets louder and softer depending on the day, tiredness, weather, etc). I don't know how this could possible be related, as I've never heard of groups of people getting sudden tinnitus together, but I do agree with you that the explanation sounds similar to what I experience.