I agree with Quinta_Essentia. The most important thing now is to get the fillings removed safely. Then you can work on getting the Hg out.
You could sue her for the records. It wouldn't cost you much and she would probably just hand over the records with just a letter from your Lawyer. You could also sue for damages if you can link your illness to the Hg.
I would love to see every Dentist who has used or is still using Amalgam fillings, sued for every dime they have. I'd then like to see them all locked up for life. I'd also like to go after the Bastards responsible for poisoning us with Fluoride (but that's a whole other issue.)
I had to contact one of my old Dentists (who I hadn't used in over 15 years) to find out if he had used Amalgam on my two root canals. They didn't give me any problem. Unfortunately, I found out he used Amalgam under both crowns!! Aaaaaaaaaaaah!!