MILD CONCUSSION-DOCTOR MEDICAL HEAD?

I had a mild concussion I believe 3 weeks ago. I was hit in the back of the head by a football. For 2-3 days after I had a bad headache. Then the symptoms stopped. All of a sudden this morning when I woke up I had a really bad headache, it seemed to be behind my right and and through my upper nose and ear. This headache has not gotten any better throughout the day, my vision was also blurred this morning. What is your advice?