I've moved house a few times because of the low frequency hum. It drives me absolutely insane, to the point of sleep deprivation and major anxiety/stress. I can

I've moved house a few times because of the low frequency hum. It drives me absolutely insane, to the point of sleep deprivation and major anxiety/stress. I can't explain why some places I lived in had it, and others didn't, but finally finding a city/area that doesn't have it has ensured that me and my family will live here forever. The main thing I could think of that those places had, was most were in built up areas. Inner suburbs of major cities, apartment living, etc. It was like a very very low frequency hum in the back of my skull, at the absolute bottom limit of being audible but definitely a distinct sound.