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I've been going through some tough times with sleeping and a bit of voice hearing, and have been trying gibberish as a form of meditation. It seems to loosen up the chest and the mind very well, I had the idea from an old Osho meditation. It seems to work best when you feel the words in the mouth, in your ears and in your mind at the same time, mindfully gibbering until your whole being is full of it.
Anyway the problem is these invaders are acting against the harmony of mind and body, creating chaos where there should be order. Yesterday I did an exercise with a forming a body of light around this one that seemed to do some good, and that helped.