Basically, BC stands for before Christ and AD stands for Anno Domini, Latin for in the year of our Lord.. The transition point between BC and AD marks the approximate time when God incarnate came down to earth to live with His creation.
The only area that is involved is the spot direcly behind my right ear lobe where it sinks in, not futher behind where the gland or lymph node is. I have gotten swollen lymph nodes before, this is very different. My inner ear, and throat and all other surrounding areas aren't in pain at all.
Carotid artery dissection can produce one sided pain in head behind and above the ear. Carotid artery is the main vessel from the heart which supplies blood to the brain. If right side of carotid artery is dissected it may cause pain above the ear in the head. The pain is sharp and sudden in onset.