Chlorella will attach itself to mercury (which is why it can be helpful while chelating), so it's quite possible that it's pulling mercury from your fillings and that's what's causing your pain. Chelating of any kind with silver fillings still in place can be dangerous. I suggest you not use the Chlorella while you still have fillings in place. The fact that the pain stopped when you stopped using the Chlorella is a pretty strong indicator that it's causing the problem.