Can you black out from turning your head?

Not usually. You might get a stiff neck from turning your head too far, however. If you are referring to shaking your head (as in the sign for "no" in western cultures), that too should not cause you to black out. But if in fact you have suffered dizziness or blacked out after turning your head, you should discuss this with your doctor. You may have a treatable sinus infection or nasal polyps, both of which can affect your balance and cause dizziness. Blacking out, however, may be a sign of something more serious, and a physical exam will find the answer for you.