I slipped and hit the back of my head 5 days back. I felt nauseous and went to the hospital, the doctor said it was a concussion and if symptoms get worse i should come back, i went back 2 days later because my headaches were getting worse and i was still nauseous. the headache was mostly around the front of my head, so the doctor said its a migraine i should be fine. but its been 2 days since that, and the headaches are still bad