I love to suck on pacifiers?

Its called an oral fixation. It starts at around 18 months and usually ends around 2 years old I believe (according to Freud). I would expect something traumatic may have happened to you around that time which caused you to hold on to that event in the back of your mind. And a similar event took place recently which brought that stress and memory closer to the surface. I would see some one about it to try to figure out what it was that happened to you. You may never find out what it was, but its worth a shot.