I have had a headache now for 5 weeks in the same place on the back of my head but to the left a little bit (kinda behind my ear) i was scanned a few weeks ago and there was nothing (although i was convinced they had missed something for a while) The hospital thought it was painkiller headache (used them for too long) but obvously i didnt use the painkillers till ig ot the dam headache ANyway they say ther eis nothing wrong so i just got to kinda live with it - my GP says he thinks its tension because my arm hurts too and he says thats a trapped nerve due to the way im holding myself because im so tense !! Bloody anxiety hey !! xx hope it eases for you soon !!!