What’s Causing My Seven-Year-Old’s Head Shaking?

My seven-year-old occasionally shakes her head. Three weeks ago, she was hospitalized with a headache due to sinusitis and was discharged a week later. For about two weeks now, she has been experiencing occasional head-shaking. I took her to the pediatric department today, and the doctor also couldn’t find any specific disease, just prescribed medication to try. The medication includes Gossypol Tablets, Cephalon Tablets, and Pentavitamin Lysine.
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