I have a scar over my left eyebrow that goes from my hairline to my eyebrow that I needed 8 stitches in.
I acquired the scar by missing a step. going over on my ankle in the process (leaving me with ligament damage), falling forward, and smacking my head against the edge of a door.
I didn't have a CT scan as I had not been knocked out but it took several weeks before the bruising had finally gone, and for at least a couple of years , when it was cold in the winter, it was painful along the length of the scar and still aches if I am outside in very cold weather.
Yes it does take some time for it to heal and the pain to stop and if your injury is on the top of your head, is bound to make you feel a bit unwell, until the swelling has gone down.
However, if you are still concerned, please see your GP again or I would usually suggest even going back to A&E .
Only you know how it feels and how it affects you . But be prepared for it to heal slowly before you feel a bit more normal.