ive been getting pains on and off it started since december last year in the back of my head sometimes it moved around but mostly its at the back of my head and i get pain yesterday it happened again i felt dizzy with it too when i was standing it really did feel like i was going to faint i just had to lie down the pain is there alittle today just wondering what it could be can anxiety cause this it makes me think it could be a brain tomour its making me worry anyone else get this