Well yes, since you have pain
and nausea and headache
, please see a doctor. You need complete neurological examination. Depending on result of examination, you may need CT/MRI.
A concussion can last for weeks after the head injury. The symptoms too vary from person to person. Headache, confusion, memory loss, dizziness, nausea vomiting, slurred speech and fatigue are common. Delayed symptoms include depression, irritability, sleep disturbances, seizures, loss of smell etc.