Hi Viv,
I'm very sorry that you are experiencing those headaches. I often get the TMJ (temporo-mandibular joint) type headaches that have been mentioned, and they can be pretty nasty. However, your symptoms don't sound the same as mine, though I guess there is still a chance that the cause is similar.
For me, all I have to do is bite down too hard on the right side of my mouth, and a headache is triggered. Or, if I turn my head sharply to the right, or put pressure on my neck, like tying a tie, I can trigger a headache. But they always occur only on the right side of my head.
Most of the time, a couple of Motrin tablets are enough to help, so like I said, I doubt you have the same problem.
I just hope you feel better fast Viv and that you can get the treatment you need. Hugs, jack