i've been having headaches all day, everyday for the past 9 months, im concerned to what could be wrong, i've tryed loads of different painkillers such as paracetamol, Anadin, Codrydamol, Iboprofen etc, a friend said it could be something to do with dairy products the only problem i had when i was younger was being sick when i drank too much milk but even when i dont eat or drink dairy products i still get the awful headaches, could this be anything serious, or what could it be?