I have the same headaches! I havent been hit in the head I don suffer from a concussion! Let me tell you though a year ago my headaches started and THEY ARE THE WORST thing any one can imagine! I have alot of medicine but they dont help. I go to bed with a headache I wake up with a headache. I have been to the ER they look at me like what do you want us to do..... DAMN doctors.
I hope you find something. I feel your pain.