My hubby and I opted for extractions of the teeth. We jumped the gun, we did not realize there was an order and you need a Biological dentist. I was 45 at the time and I have had bad teeth for years..I was ill when I had them removed...I did not realize how ill I was. But I survived..:) I would suggest you have one tooth done at a time...either replacing the fillings or extraction your choice..I would go to a Biological dentist. Plus we had all root canals removed, they cause health issues too.
I really wish you the best...don't give up on finding a way to heal.
Remember most conventional Dr's don't heal they just cover up the problem or make it worse.
My favorite saying in life lately is, Positive thinking brings positive results :)