The Hum etc.
Since the beginning of this year I have been hearing a hum that changes its pitch and then changes back. It isn't intrusive although at first I was a bit panicked because I thought I'd moved house to the wrong place. When I worked out that it came from the air or from me, that was OK, then I read about other people's experiencing it too. I also get a very cold head and have to wear hats a lot; and I experience headaches; loneliness; tiredness; irritation. I could go on - but there's also beautiful exhilaration and joy which is the main thing.