Look around on the chelating message board, and you can find out about heavy metal tests. Unfortunately, the tests range from not especially reliable to useless, so I would treat any results you get from them with skepticism.
What color are your fillings? If they're silver or the blackish color silver fillings become as time goes on, then they are mercury Amalgam fillings (more than 50% mercury) which are constantly leaking mercury vapor into your body. Calling your dentist to confirm is a good idea. If they are amalgam, you would really need to replace those little lumps of poison and chelate the mercury out of your body.
I hope our advice helps you. It sounds like you really need it.