Why do I have pain when chewing three weeks after fillings?

Three weeks ago, I had two impacted bottom wisdom teeth removed. One wisdom tooth on top removed and seven fillings. Four of the seven fillings were old silver fillings that were removed them redone with the tooth colored fillings. I still can't chew without pain. It was feeling somewhat better and I ate some things that had to actually be chewed and now I'm miserable. I am living on ibuprofen and am extremely frustrated. My dentist has the attitude that it will just take time.