Migraine happening daily, especially starting after a head injury even with a normal CT scan, usually needs a different approach than taking a rescue tablet every time. That one medicine working for you shows the migraine can be controlled, but relying on it daily isn't a safe long-term plan.
Next Steps
See a neurologist for a preventive migraine plan, since options exist that reduce how often attacks happen rather than only treating each one. Keeping a diary of triggers, sleep and meals helps guide that plan.
Health Tips
Go in sooner if the headache pattern suddenly changes, becomes the worst you've ever had, or comes with weakness, vision loss or confusion.