In view of normal CT brain and the brief description you’ve provided you’re likely suffering from primary headache.
There are two sets of medicines - abortive therapy ( i.e you take when you get headache) and prophylactic medicine ( to prevent you from having headache).
Will need more details to advise further
Next Steps
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Health Tips
1. Maintain a headache diary ( frequency & intensity of headache ( scale of 1-10), associated symptoms, any aura, medication that helped stop the headache)
2. Sleep hygiene
3. Adequate hydration