@med216 I also have ON. My pain is just like what you described plus other things. The pain can move down the face, around the eyes, to the ears, and you may think you have a toothache.
Mine started with my left eye temporarily losing sight 3 time within 2 days.
After finally being diagnosed correctly I started P/T. There they taught me how to stretch my neck muscles. I also figured out that my new bed pillow was to blame. It held my head it a bad position.
I’m better now, but still get episodes of scalp and neck pain. When it happens I stretch my muscles.

I wish you the best.