Coffee and Caffeine FAQ

Yesterday about 2pm, the inside of my head began burning in the sinus and forehead areas. This went on for about an hour leading into pressure building within my entire skull. By 4:30pm I was on the couch in agony that was only just beginning. My head felt like it was going to explode. I had to sit up with my head laying on a pillow in forward position over the back of the couch to even get a touch of relief. Two Advil did nothing. I became nauseous but never vomited. By 7pm, I took 2 Extra Strength Tylenol. 30 minutes later I started to get sleepy and enter twilight state, and the pain began to relieve somewhat. I was able to eat something by 8:30 or so. This headache was scary.

It didn't occur to me until this morning that I did not drink coffee all day yesterday. I usually have 4 cups of high quality coffee a day (i.e., Seattle's Best, Green Mountain, etc.)

Is this a withdrawal headache? Anybody have this experience?