hello and welcome to HCM,
Dental pain in an already filled tooth indicates the presence of infection below the filling .
indicates bacterial decay or infection in the tooth that involves the exposed tooth nerve tissues .
such infected tooth needs to be treated by a root canal
procedure so please consider getting the treatment done by consulting a dentist
you may need an OPG radiographic examination done for your teeth to confirm the presence of bacterial decay or infection in other teeth of upper and lower jaw and accordingly treatment can be done .
i would suggest you to start with antibiotic Augmentin
625mg along with analgesics like aceclofenac
two times daily for 3 to 5 days which will help in subsiding the pain and prevents infection.
i hope this helps ,