Hello!
I understand your concern!
In my opinion your troubles are due to a disorder called 
trigeminal neuralgia. It is an inflammation of the 
trigeminal nerve, which is the main nerve responsible for the sensitivity of our head. 
It may be without a cause, but most of cases it may be caused by an infection, or a 
brain tumor, an abnormal vessel, or a 
cyst.
I would recommend you a brain MRI to rule out anatomic causes.
If you were my patient I would treat you with 
carbamazepine or gabapentine which are very helpful. 
If these treatment doesn't give good results consulting with a brain surgeon may be necessary , for specific therapeutic procedures.
Hope to have been helpful!
Best wishes Dr.Abaz