Melanie,

Headaches are one of the most common complaints people have with mercury-based fillings. You may want to ask yourself if you have any other symptoms that may be manifesting more subtly, like lower energy levels, or brainfog from time to time, even joint pain or digestive issues as simple as more gas than usual. These are all commonly associated with mercury. The reason I mention these things is because it would provide you with more evidence that mercury is the cause, if indeed it is.

There is a lot to this issue, like if you mix mercury with aluminum, the toxicity increases up to 100-times (not percent). Also, when you have mercury fillings removed, only have it done by a doctor who is specially trained to do it correctly, otherwise you can get exposed to large amounts of mercury vapor. I know many who have acquired serious illnesses after having amalgam fillings improperly removed. Fortunately, it sound as if you were lucky this last time.

Anyway, there is no easy way to determine if mercury is the cause because in people who are in the earlier stages (1, 2) of poisoning (which usually happens in the first 20 to 30 years of amalgam exposure), blood and hair mercury levels show up very low in tests. Even urine and fecal extretions are low. This is because the body harbors the mercury, especially the brain (Mercury binds to sulphur and most proteins have the amino acid cysteine which contains sulphur binding sites.) This is why standard hospial tests are useless. You have to have a hair analysis and look for "signatures" that are caused by mercury, such as are explained in this book:

Hair Test Interpretation: Finding Hidden Toxicities

Most doctors know nothing about diagnosing mercury so numerous people suffer for years needlessly.

It will be hard to determine if mercury is the cause of your headaches unless someone who understands the signatures in the above book interpret them, or until more symptoms manifest that are known to be associated with mercury, which may take years.

And to answer your other question, yes, only two or three fillings could cause these kind of symptoms. Again, headaches are one of the most common complaints of mercury toxicity as mercury deposits itself in brain tissue.

Hope this helps.