Headache need to evaluate thoroughly, please give full history like when it occurs, how severe, which part of scalp envolve etc any stress? 

Get your blood-pressure checked. Reduce screen time. Get your eyes tested. Get your vit-b12,vit-d checked. Get adequate sleep. Reduce stress.

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With this in complete history of headache from last two years very difficult to reach any conclusion the headache should be described in the form of its duration severity,time of occurrence, It’s radiation does it present throughout the day any other associated symptoms you are facing beside the headache kindly consult with a complete history because some of the causes of headache are curable while the causes like brain tumour which had a constant headache throughout the day for a long period of time or any intracranial lesion can cause this

Check eyesight. Most refractive errors begin as headache. Stress (tension headache) are more on the sides. Sinusitis causes pain at the back of the head and between the eyes. Weakness in body could be due to vitamin D deficiency and headache could occur from pain of neck muscles.

Take p500 if needed c.caldikind once daily for 1wk