Ok, I have some vague memory of reading/hearing that shaking your head is an effective way to increase lucidity or prevent pre-mature awakening. It’s probably effective since the main thing all of the other techniques (spinning, touching face etc) have in common is that they activate senses.
But it just might have the opposite effect, who knows? All we can do is try, so in your next LD remember to shake your head when you feel that you are loosing grip of the dream world or just need to increase lucidity.
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Oh and the way you shake your head… try different way (left-right shakes, “head banging”, etc 
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