I would suggest a physician examination.
If there is concern about the headache (i.e. suspicion for cancer or a bleed), your physician should obtain head imaging with a CT scan or MRI.
Other causes can include migraines, a tension headache, or rheumatological disease like giant cell arteritis.
Your physician will be able to narrow down the possibilities, and obtain the appropriate imaging and blood tests.
Followup with your personal physician is essential.
This answer is not intended as and does not substitute for medical advice - the information presented is for patient education only. Please see your personal physician for further evaluation of your individual case.
do your shoulders hurt at all? if so ask your doc for a mild muscle relaxer, i had the same thing come to find out i was walking with my shoulders shrugged, and had all my muscles in a tense state. i am fine now and the muscle relaxer worked wonderfully (skelaxin)