Hi,
I'm the same age as you and I had my amalgam fillings inserted when I was around 10. I would recommend replacing your fillings at this age as your body's at it's prime (even though it doesnt feel like it) and thus you should recover quicker.

I had my fillings replaced with white fillings and I feel a lot better. So I can only assume there's no mercury in them.

The seeping questions is one I've thought about. I know people with amalgam fillings who seem fine. This is either because their body's strong enough to cope with it, or it'll affect them in time, or their fillings aren't leaking. I don't know.

Feel free to pose any other questions.

I had three fillings replaced. I'm now, after 3 months, starting to feel a lot better.