It's also important to remember that fillings aren't the only source of heavy metals (many people get their first dose of metals when they are inside their mothers' wombs. Lead paint, fish, tainted drinking water, pollution are some possible sources of metals).
Of course, I can't say with certainty that metals are your problem, but I suggest you continue to find out more and make your own judgement. You may be intolerant to whatever material is in your fillings.
One thing which might help is to figure out when your symptoms started. Did anything happen which may have triggered them? Did they develop gradually or suddenly?