Hi Doctor, I never used to get any headache but since last year, usualy in summer i get realy bad headaches. I dont like to take pain killers so the headaches are very bad, I can not even more my eyes as the pain gets worse. as soon as i go out in sun it starts..but not all the times. I feel as if my blood is so thick that its not reaching my head. I am healthy , 160cmand 55kg. thank you so much for your help