There may a high point on the restoration (filling ) which is hurting you or there might be some infection still left which will resolve if you have taken prescribed medication by ur dentist
For now
Take tab diclomol BD for 3 days
Next Steps
Visit ur dentist, mostly there will be high point (overfilled restoration ) which can be adjusted by ur dentist and a radiograph will give a clear picture about the tooth or if there is still infection under the tooth
Health Tips
Don't bite anything hard from that tooth
Eat soft food