What Causes Chronic Left Sided Pain From Forehead To Chin?

I have severe headaches from my forehead down to my chin - on the right side of my face. Goes on for 8 hours and I have nothing that will take away the pain I am enduring. I am not disorientated, dizzy, nauseas etc as it usually happens from the time I go to bed. I am also very sensitive to noise. I looked at my diet and cashew nuts are eaten - about 10 at a time. Do not drink or smoke. My neurologist is sending me for a MRI Scan this week. My mother, sister and aunt on my fathers side all died with brain tumors so I am a little worried and hope that the cashew nuts are giving me grief etc Have no money to pay another medical bill as my War Pension has not come through as yet due the Christmas break and I the MRI Scant to pay for and the taxi the hospital - 100klm round trip!