Re: Extreme pain in a filing when eating hot food
It sounds like the filling was close to the nerve, and those can be sensitive to heat and cold for a while, especially if it was a silver filling rather than a white filling. I had a deep silver filling, and it hurt if cold touched it for a few months. Then the sensitivity went away.
For now, I wouldn't worry too much. If it seems to be getting worse, like hurting with all pressure, try to at least call the dentist who did it.