I also had parasite issues (worms and blood parasites). I attribute that, like my other problems, to my compromised immune system that was the result of mercury.
I went to a holistic dentist who is strictly "mercury-free" and who understood the procedure for removing Amalgam fillings. He was expensive, but not insanely so, especially considering I had 12 fillings to be removed and then another 3 cavities to be filled on top of that.
He replaced the fillings by quadrant (e.g., top left, top right, etc.) over four appointments, spaced out over two weeks. I literally began to feel better after the second appointment.