Mike,

At this point, a CT Scan is not going to be of any value. You don't sound like you have any symptoms that suggest a CT Scan is suggested.

You may have an injured/bruised artery.

Your GP is right about concussions can be slow healing.

The best thing for you is to lay low and get quiet rest. Read the Vitamins sticky at the top.

btw, You symptoms are quite normal. If you have any tenderness behind your ears, it will help to ice the back of your head and neck frequently.

You are not experiencing severe symptoms like many do.

My best to you.