I had a problem with daughter getting headaches due to LED lighting. Changed make of bulb and it seemed to have stopped it, but since it does not affect me, hard to work it out.
If sound some thing must make it, if light some thing must make it, so step one with electric turned off do you have a problem? It does not matter if there is a 400 Hz in the street, it needs to be in your house.
There are things which can produce sound waves even if not within human hearing, and can also transmit RF, although I personally have never had a problem with RF on my body, however although a switched mode power supply may be in kHz range, the harmonics may not be.
I have read, and often ignored warnings on lighting transformers that the extra low voltage wires are limited in length, and I have seen LED bulbs marked 50 Hz, which seem to work OK with a kHz electronic lighting transformer, as to why marked 50 Hz I have guessed because many electronic transformers have a minimum output where toroidal transformer has no minimum output, however there may be other reasons including causing the combination to transmit.
I know my house 2019 was mainly tungsten (left by previous owner) and now mainly LED, there are some CFL but all has happened in the last 5 years, I still have a stock of tungsten bulbs, I really should bin them, but so much has changed in the last 5 years, my fridge/freezer and freezer is three phase powered from an inverter, my washing machine the same. The tumble drier is a heat pump, not a clue on frequency of my induction hob.
So only way to work out what is to switch items off.