First of all, you must understand that removal of mercury fillings need a simultaneaous dose of and antidote, otherwise you get pains. There are always particles that do not get washed out, but fall in the hole in the tooth. These can be too small to detect but they are there nonetheless.
Can you tell us wht type of pain you get in the evening, less or more? is the tooth excessively sensitive to touch? Does the pain make your mouth water? what taste do you have in your mouth?
I have a few ideas, but want to make sure.