Hi, If I were your treating Doctor for this case of severe headache one sided, I would come up with possibilities, these include a) usually one sided headache is migraine headache where u have symptoms of blurring of vision , irritated to hear noise in surroundings and preferred to bee in dark room and with silence. so if that is the problem take tab.migranil when you get the attack. drink plent of fluids b) the other type is stress headache, where you feel pain in the head over all but mostly above the eye brows. so drink plenty of fluids and take analgesics or pain killers which includes tab.DArt or tab. aceclo-p. c) finally but rarely check for your blood pressure whether it is high or low.