I feel like it happens when my anxiety is up. Like when I am home at night by myself hearing things that aren’t there. I did read about ear worms. . They suggest chewing gum. I’m going to try that. When I have a song stuck in my head I’m OK with it because I just listen to it over and over again until I’m done with it. But annoying sounds drive me crazy. At one point we had an issue with our water heater and it would make this loud screeching noise every once in a while. Well that sound got stuck in my head and for freaking hours I couldn’t tell whether or not it was still doing it or not I was sitting there in the middle of the night opening the basement door to listen to it to see if I got louder or if it was just something in my head.