Hello there ,
Thanks for writing your query,
According to your history i can suspect some remnant of the infected pulp tissue has left unexplored during the
root canal procedure or there is a missed canal due to which the infection has gone worse and you have developed a
periodontal abscess due to spread of infection to the underlying tissues.
This type of periodontal abscess drains in the oral cavity and may lead to
nausea and
vomiting.
This type of periodontal abscess needs to be drained and compressed in position and then followed by a course of antibiotic and
analgesic will subside the symptoms of pain and swelling.
once the abscess is drained the infected tooth needs to be explored again for root canal procedure.
Once the treatment is completed , the fractured tooth can be restored by a post and core preparation with a prosthetic crown coverage.
you need to get an x ray done the affected area to confirm the presence of infection,
exact diagnosis can be made only after clinical examination and evaluation by taking radiographs.
i hope this helps ,
take care.