For about three weeks I've had a strange headache that comes and goes dozens of times each day. It's only on the right side of my head, maybe two or three inches above my ear. It starts out sharp and fades. Turning my head to the right often triggers it, and sometimes nodding. (Coughing, sneezing and exercise don't trigger it).
It's not horribly painful, nor do I have other symptoms. What could possibly be going in?