Intermittent Tinnitus

Hello,

I'm in my 20s. My hearing was tested and it is very good in both ears.

But sometimes (a few times per day or only one time per day) I have a high pitch squeaking or whistling sound in my right ear. It has either a very short duration (< 1 sec), which occurs a few times, or it stays permanent (constant sound) and goes away after 10-15min. It is only audible if it's quiet.

I've heard something about SBUTT (Sudden brief unilateral tapering tinnitus).

So, what do I have?
Is this a really tinnitus or not? Or is it just a natural thing?