I presume you will have an MRI to determine that your brain, its circulatory system and associated structures are OK and that there is nothing there that shouldn't be.
I don't have a headache problem but generally associate your type of headache with stress in the shoulder/neck area. Does anything make it change like position, lying down, head movement, etc.
Blood pressure normal? Bowels and bladder working OK? Sometimes when they aren't it causes pain elsewhere or sometimes a headache.
Be interested to see what tests show.
"...only the shadow knows"