The main reason you feel it is because the fillings are touching your nerves in your teeth. There is not enough dentine between your filling and your nerve. This may be the state of the work done or you may have active decay under the filling. This happened with me. After about 20 years the old Amalgams begin to disintegrate and become porous allowing bacteria to enter and begin decay on the tooth. These must be replaced. I waited too long and my teeth actually rotted away within a few years between 47 and 50 years of age. By luck I ran into the greatest dentist on the border of Texas, the website I made for him will tell you more. http://www.painlessdentalwork.com If you have any questions, beam em over.
Weyman