Last night out of nowhere I heard this loud high pitched shrieking sound. It was much louder than my normal t. It lasted a few minutes then went away and then started back up. I woke up in the middle of the night still hearing it. I can't hear it now but my regular t seems much louder today. The weird thing is that I went for a hearing test yesterday and although all of my tests have always been normal this test was even better than the other ones. Although this high pitched sound and louder t happened after the test. Anyone have any idea what is going on here?