Sharp, lasting pain in front through back of head. dizziness. vertigo, with nausea/vomiting. ongoing for over a month. not sinuses. help?

Check it out: May be time to see your doc to rule out serious causes

Likely migraine: what you're describing, is a migraine or vascular headache. Discuss this with your doctor so appropriate treatment can be started. A daily headache for a month is not normal.

Neurologic: That constellation of symptoms often is the result of a neurologic problem or a variation of a migraine, such as a vestibular migraine. Especially if CT scan of the sinuses was normal. However, any more conservative diagnosis such as this can only be entertained after properly ruling out the big bad possibilities like a tumor or severe progressive neurologic infection.