I have it. It actually got better and stayed better for years and then I had surgery to remove my uterus. As soon as I woke up I asked for pain meds because my head hurt so bad. And then it stayed that way for a year. Now it just hurts when it gets aggravated by being touched. I suspect the base of my head was resting on something during surgery and that is why it came back after surgery.
I believe my ON was caused by a fall off a horse.