Severe pain on one side of the head, along with giddiness for 15 days, can happen because of migraine, inner ear problems, sinus issues, nerve irritation, cervical spine problems, blood pressure changes, or stress-related headache. However, continuous symptoms for many days should be assessed properly, especially if the pain is becoming stronger or affecting daily activities. A neurologist is usually the most appropriate specialist for persistent one-sided headache and giddiness, while an ENT specialist may also be helpful if dizziness, ear symptoms, or balance problems are prominent. Tests such as blood pressure monitoring, eye checkup, MRI, CT scan, or inner ear evaluation may sometimes be advised depending on symptoms and examination findings. Adequate hydration, proper sleep, stress reduction, and avoiding excessive screen exposure may temporarily reduce headache triggers. Vomiting, weakness in the arms or legs, blurred vision, difficulty speaking, fainting, or sudden worsening of the headache may indicate a more serious neurological problem and may require prompt medical attention.