Hiii mam,
I would recommend you to get the X-ray done for the tooth, because there can be two reasons either your tooth is touching the opposite tooth or there is an reinfection, in first case we normally reduce the height of the tooth in second case we have to do the re treatment. So X-ray can help us decide the treatment. Sometimes neither of it’s true, just a 3 days course of antibiotics can help with the pain. Also you did not mention about the cap on the tooth after the treatment, if it’s not done this is the primary cause of the pain.
Next Steps
Visit the dentist as soon as possible