There can be many causes of
headache, hypertension, stress, lack of sleep,
hypoglycemia, chronic headaches related to syndromes like migraine, cluster and tension, a space occupying lesion if headache is accompanied with seizure, nausea or weakness of limb, ruptured cerebral aneurysm not unruptured. Unruptured aneurysm usually remains asymptomatic and is an accidental discovery on an MRI or after rupture.
Consult your neurologist if these possibilities could be ruled out in you. Take care.