What Causes Headache And Dizziness At Night?

hi im 18 years old and i have been having a headache for the past few days but the thing is that it only comes at night... i feel perfectly fine during the day until about 9 o'clock then i start to have a headache, then i get a temperature, then my eyes start to hurt, then i get dizzy and light headed... could this be serious?! please help... thanx :)