don't be confused by the symptoms, they can be caused from a root canal or from a root canal that wasn't properly cleaned. amalgam can also cause these symptoms and reoccurance is very common, especially if you don't chelate.
it is not the kind of infection that causes fevers. it is an anaerobic infection and those don't cause fevers and stuff like aerobic bacteria do.
don't start chelating until you find out if you have a cavitation where that root canal was. otherwise, you can push toxins through your body and get sick.
first of all, what was the method used when the root canal was pulled? it should have been cleaned with a burr, then a curette, then flushed with an aneseptic, then stitched. no gauze or anything should have been put in and no medications. let me know if this method was used, or if you don't know, and i can tell you where to go from there.