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.
Re: Headaches and pressure behind my left ear. You will find many here who deal with headaches and pressure both pre and post treatment. For some it's random and comes and goes, others deal with it more ongoing. There are also many folks, who have no issue at all with headaches. I was also diagnosed with a 1.8cm AN on my right side.