Head injury over a week ago. Will I be ok?

I suffered a head injury around 11 days ago where i was forced into a glass door and hit my head really hard. I was disorientated for a few minutes. I later ended up in casualty with concussion. Since then I've been feeling dizzy and tired. I've been back to see a doctor since and they said I will be ok and that I'm just worrying. Don't know what to do. I just don't think a head injury should be taken for granted and feel as if they have not taken anything into consideration.