It is very reassuring that your CT scan is normal, as this rules out serious structural brain issues. Your mild headache and itching may be linked to common, easily treatable factors like seasonal allergies, stress, or dry skin. For temporary relief, you can discuss using over-the-counter generic options with a pharmacist: a mild pain reliever like acetaminophen for the headache, and a non-drowsy antihistamine like cetirizine for the itching. Since these symptoms have lasted for a month, please consult your primary care doctor. They can evaluate you to find the exact underlying cause and recommend a targeted treatment plan.