If you have high blood pressure, it will be possible that your head behind the ear will feel uncomfortable.
The reason is that the pressure of your blood against artery walls inside your head is higher than normal blood pressure, which is around 110 mmhg.
If your artery is strong enough there will be no stroke.
If your artery is weak there will be stroke.
Stroke means the artery is burst and the blood will leak outside the artery.
Try to find out your body characteristic to solve your high blood pressure, because different people different reason, and different way to cure.