causes dizziness and headaches
1 Low blood sugar. 2  Another possible cause of both headaches and dizziness is low blood sugar. 3  This is most likely to occur several hours after your last meal. 4  Eating small, frequent meals should help stave off these symptoms. 5  If you are diabetic, be sure to monitor your blood sugar levels throughout the day.
Other serious causes of headaches include: 1  Stiff neck, fever, and rash. 2  Elevated blood pressure.