It is very likely that the dentist got too close to the root when he did the filling. If this is the case, it can hurt for a very long time and eventually will settle. The other option is for the dentist to take out the filling and treat the root before filling it up again.
It is best to see the dentist to make sure that an abscess is not forming or has formed. In this case you will need a course of antibiotics to get rid of any bacterial infection.
It is the 14th today, so I do hope that it has started to settle, if not, keep badgering your mom to take you back to the dentist.
Best wishes.
Going back to your dentist to have further treatment is. Advised.