How long do headaches last after a car accident it's been almost seven days since the wreck.

I had a CT scan and they said it was ok, that I had a contusion maybe a bruise brain. I'm just worried because people tell me they usually last about 2- 7 days. I haven't seen my headache go down at times it feels like it going away but it then comes back. At first computer screens will hurt my eyes. But is going away. Well the computer screen didn't hurt my eye's I just felt like my eyes will become strain faster.