I have a severe headache problem from last 5 years like 5 years back I use to walk in the sun for only 10-15 min and only that much time my mainly the half head pain like so bad somehow I try to sleep at that time but little amount of light and noise irritate me so bad at that time and when I wake up after sleeping the pain becomes more worse and as soon as I stand up from bed for sec everything blackout and I fell on bed later when my school got over I didn't go in sun but I get serious pain in my head often these days I get pain in neck area too and nausea at that time I avoid sunlight because I am not able to tolerate it for minutes even.