I had it for high pitched sounds as well, went on Beta Blockers for migraines and it fixed this as well.
The noises are triggering your adrenal response and your body is screaming at you that the noise has to stop and it doesn’t matter what it takes. Beta blockers block adrenaline, so now noises that used to set me on edge are just normal noises to me.
I think one of the current hypothesis is that it might be close to a sound that would attract predators, but sometimes wires get crossed and you have the reaction to a random noise.
Most commonly it’s people hating the sound of others chewing.