Hello dear, Thanks for being on healthcaremagic.com. If you would have presented to me as an outpatient with this medical history,my clinical explanation would have been- Most common cause of episodic hemicranial headache with blurring of vision,from the epidemiological perspective is Migraine .Please observe whether you are having other classical features of migraine like- 1)Throbbing or pulse like headache 2)Nausea 3)Photophobia(headache increases on exposure to light) and phonophobia(headache increases on exposure to sound). 4)Visual aura-Blurring of vision you are having is likely a visual aura. If you are having above features simultaneously,then it is likely migraine.Please consult a physician so that he takes a detailed history and put you on trial of anti-migraine therapy,if he thinks rationale for the same. He may also get a Computerised tomographic(CT) scan done to rule out the secondary headache.I hope it helps.