hi nina: I just had my bridge work removed and replaced last fall because of the same thing , the dentist that installed the bridge did not remove all the amalgam under the bridge work so I know what is going through your mind , in the book " its all in your head" by hal huggins mentions that most people must remove every last bit of amalgam in order to make a complete recovery , extraction is an option ,but you may face the problem of cavitations if done improperly , chances are that there is probably a very small amount of amalgam under the crown and the exposure will probably be much less than before ,so you will rebound much quicker this time ,another good thing to remember is that once you do remove that last bit of mercury by a safe dentist your recovery will be permanent