Well... i just tried this setup
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Facing the wall, on my knees leaning backwards, the knot in front tightly pulled under my chin (uncomfortable, but able to breathe), holding the other end of the rope with my hand. Started leaning slowly backwards, but couldn't force myself to relax my body although I was very calm the whole time. Didn't lose consciousness, but started feeling building of pressure in my head and especially in my ears, didn't seem right and stopped. Now about 20min later my ears are still a bit out of it (like I'm in a plane). Was I on the right track? If not, what I did wrong?