Based on details you seem to have vascular headache
type) with chronic cervical lymphadenopathy
Since posterior cervical lymph nodes are there since 10 yrs most likely it is related to scalp infection ( dandruff or pediculosis
related) . You may require dermatological consultation .
For headache , you require Neurological assessment and may require CT scan to rule out structural causes of headache.
I hope this will help you