Thanks for asking the query,
Infected tooth needs to be treated with Root canal treatment
to save it permanently.
In this procedure the canals are removed , tooth is devitalised and sealed completely.
As you have mentioned the treatment is not completed, there can be remnants of pulp tissue left or
infection present periapically, till you visit the Dentist
next you can start with Augmentin 625 mg twice and aceclofenac serratiopeptidase
two times daily for three days, this medicine will subside the pain.
Antibiotics and analgesic
will relief the pain temporarily,
Unless you are completed with the treatment you will face pain and infection.
Hope this helps out.