Thanks for asking the query,
Pain in the tooth indicates infection, an infected tooth need to be root canal
treated to save it permanenetly.
There could be chances of reinfection of the tooth beneath the restoration, or the filling is placed close to the pulp tissue causing irritation to the pulp.
Visit to the Dentist
get a checkup done, take an x-ray of the tooth, depending upon which the treatment will be decided.
As you have mentioned you cannot visit the Dentist right now, take tab augmentin 625mg and tab aceclofenac
twice for three days.
Maintain a good oral hygiene
, use chlorhexidine
mouthwash gargles twice daily.
Hope this helps out.