If led lights are seeing if headaches for you, that's a totally different sort of frequency effect. Try wearing caps with different liners to test what helps the symptoms, also different polarizing sunglasses, or blue light blockers. Alternatively since you hear a hum, eat protection may aid you, especially the active background noise cancellation ones. I have tinnitus and different things and places affect its level, I've had varying amounts of luck with the things I've mentioned above. Good luck.

Alternatively, just out of left field, I did great something, maybe on George Noory, suggesting that the hissing is signals from The Other Side, like where the boundary is weaker or something like that. Was an interesting thought.