I have had an incredibly high pitched tinnitus sound in both ears since yesterday morning as well, it almost feels like ultrasound in that I barely hear it but instead feel it as a piercing feeling in my ears. Ironically enough, it seems to decrease in intensity when there are no sounds around me and increase when there are sounds. I also noticed that short sounds in particular seem to make it worse, it feels kinda like a noise gate in my ears when I hear short sounds.
I haven't been exposed to any loud sounds without hearing protection lately, so I have no idea where I have got this from. Should I just try to wait and see if it improves? Is tinnitus at all affected by the hearing spectrum, as in, would noises above the hearing range fade away when you can't hear those frequencies anymore or is it possible to have tinnitus sounds above the range you're able to hear?