Hey Lost, mine is super high pitch also. kinda like you described, like that high pitch sound a old tube tv would make when the volume is down.
Good weed, bad weed, it all makes it louder for me. But I have run into a few times weed that will let me get high and not notice the noise, but its been years and I had no way of knowing the strain. The worst is when you get some weak ass weed and you dont get high, but the ringing gets louder. Allthough when I smoke weed the sound changes from normal. It sounds more like a car tire loosing air...the hiss...and when I go to bed with no background noise I hear many different tones. A quiet room can be deafening.
But everyday is different, you have good days and bad, sleep, stress and diet all effect it too....Just wish I didnt have OCD along with this....makes trying to not obsess alot of the time impossible.
Have you ever noticed when you take a shower the sound cancels it out?