The exact cause of your headache needs to be investigated. Common causes of headaches like you describe include eye refractive errors and related eye ailments, paranasal sinus inflammation, cervical spondylosis and migraines. You could start with your eye doctor to rule out any eye problem. If ruled out, you could see your family physician. Please have an X-Ray of your Paranasal Sinuses and Cervical Spine ready before seeing your physician along with a basic blood work up including a CBC, Blood Sugars and Vitamin D levels. Your physician may further refer you to a Neurologist and/or order for a CT Scan or MRI of the Head for further management. Certain hospitals do run speciality headache clinics as well.