I had that in one ear for 2-3 years. By pulsatile tinnitus I assume you mean the loud "whooshing" sound that is in sync with your heart beat (hearing the blood flow basically). Doctors were pretty ignorant about the phenomenon, I gave up. It was not constant either, would go away for a few hours, start again for another few hours - repeat. One day, it stopped and never came back. Pretty mysterious.