I ve been experiencing chronic headaches for almost three years. Ever since september 2011, they ve happened nearly daily and last the entire day once they start. When I stand up suddenly or physically exert myself, the headaches become unbearable. Just recently, last couple weeks, I ve experienced fainting , tunnel vision , spinning vision, nausea and vomiting. I m only 18 and the sudden onset of the fainting and vomiting are making me nervous because my situation is only getting worse.