Isn't the body a wondrous thing? Full of little tricks and surprises.
From my scant knowledge of ON the nerves go down both sides.
I was looking into it a short time ago when it seemed that I had it.
Turns out it was just very tight and knotted shoulder muscles pulling the neck muscles down and giving me awful, relentless headaches on the left side.
With remedial massages I have been able to rid myself of these pains.
Not out of the woods, as others have started up, but a bit of progress.
I'd recommend that you get yourself a remedial massage as you are bound to have knotted and tense neck, shoulder and back muscles, which will either cause or aggravate your headaches.
It is wonderful to have a clear, light head after the massage.
As it wears off I forget how good it is, so delay going back!
Will stick to a regular one from now on.