Even the safest removal procedure can cause mercury release into a body. The effects you feel will be different according to where the mercury ends up.
I think you are fortunate that taking DMSA while you have silver fillings didn't cause a disaster for you. There are others who got much, much worse when they took a chelator with fillings.
You could try going to a sauna and drinking a lot of water now, as well as supporting your liver. Supplements and food to support your body's natural chelating systems could be helpful too. Those things may help, but I think the best thing for you to do is finish replacing your fillings and begin chelating.