Hi, I am Dr.Shreyash Mehta, MD Community Medicine
I understood your query and I hope my answer will solve your query.
You are having strange pain at the back of the head and neck.
You had a history of a car accident and
brain concussion at age of 15 i.e 50 years ago and you were unconscious for 11 days.
I think this pain which you are experiencing may be muscular in origin more may be result of you driving the car in uncomfortable position. You can take some pain killer Tab.
Diclofenac sodium and some
muscle relaxant.
The doctor may have suggested to monitor your brain health and unusual symptoms in your head at the time of accident but 50 years is a long time.
I do not think it is cancer as you are having the headache for several months. Also I do not think you have stroke as the head is followed by
vomiting, loss of movements,
paralysis and unconsciuosness (at times).
Just relax, take some combination of Non steroidal anti inflammatory drug with a muscle relaxant. Try for 2 days or so.
If this does not help then you can contact your physician.