This has been an issue since I was about 3 years old. I can’t stand the sound of sniffling, chewing, mouth breathing, throat clearing, coughing, or those rambunctious noises boys make when they play (crashing, whistling, fighting sounds). When I was little, it made me angry, but it also manifested as “a bathroom problem” because I would run to the bathroom and feel like I really, really needed to pee. So weird, and totally awkward, and I was mortified when my mother told her family about it and they just didn’t get it.
Now, I’m 28 and cope with it better but it’s still incredibly difficult, and it’s made school a living hell. I couldn’t concentrate if I heard those noises in the classroom, or the office (as an adult, obviously), and it’s a minor miracle I managed to get my MLS at all.