Back (right) before Mercola went dark I looked into root canal/pull. Basically, don't get root canals. The filler can never fill all the vessels in your tooth, it contracts when it is hardened, and you will always have an infection your body is fighting. It will matter whenever your health is compromised. Also having two different metals in your mouth causes a galvanic battery reaction more powerful than your brain uses. If I were you I'd have it pulled. If you get an implant, get a ceramic one.
I think I may have jumped to conclusions… fillings are alright if you're not doing a root canal, but do ceramic ones not metal.
Not sure your exact symptoms meaning. But, the trouble comes when you have a root canal, you kill the tooth and therefore no longer have your natural fluids flowing through them to clean them. If it was just a filling, it isn't a dead tooth. If they were root canals I'd get em pulled. If it's a filling you should be alright. But given what you are asking, I would confront the dentist you went to and ask if maybe the filling wasn't fully hardened (as you had implied possible). They might not charge you if it's their fault.