Because you experienced a head injury and are now having nausea along with localised head pain, you should not self-medicate. These symptoms can indicate a concussion or a more serious internal injury. Taking pain relievers like ibuprofen or aspirin could be dangerous if there is any internal bleeding. Please seek immediate medical evaluation at an urgent care or emergency room. Go immediately if you develop worsening headaches, repeated vomiting, dizziness, confusion, or vision changes. A doctor needs to examine you before you take any medication.