are your headaches worse when you wake up or when in the up right postion? do they get a little better when you lie flat? if you see the headaches getting better while lying flat.. you might just have what is call a cerbrospinal fluid leak.. this is due to a rip in your dura a.k.a. spinal sac, which cause your spinal fluid to leak out side of the dura and cause a low pressue. this cause headaches, vomiting, pressure behind the eyes. I HAD THE SAME THING AND WAS TOLD IT WAS MIGRANES