I am experiencing pressure build up in my head that comes on quickly, builds to a point of explosion almost and then fades quickly.

Get examined: I would recommend that you have your blood pressure and pulse checked specifically, if possible, during symptoms to determine if there are abnormalities during those symptoms. If none, I would suspect hormonal swings or anxiety states as possible causes.Your symptoms don't suggest neuralgia which is usually more of shooting Sharp pains. See your MD for evaluation.