Potential Causes for Headache Despite Normal CT Scan:a. Tension-type headaches or migraines.b. Medication overuse or withdrawal.c. Stress, dehydration, or lack of sleep.

Immediate Recommendations:a. Ensure adequate hydration and rest.b. Consider over-the-counter pain relief like ibuprofen or paracetamol, if not contraindicated.c. Monitor for any new symptoms or changes in headache pattern.

When to Seek Further Medical Advice:a. If headaches persist or worsen.b. If accompanied by other symptoms like vision changes or neurological deficits.