Hello there ,
Thanks for writing your query,
According to your clinical history i suspect your dentist
has gone for coronectomy
of your tooth due to crucial anatomic position of the tooth roots.
Your tooth is may be in close proximity to the vital structures and extraction of such teeth may end up in complications.
i would suggest you to start with a antibiotic and analgesic
course consulting your dentist , which helps in subsiding the pain.
if the condition doest not subside with this ,
you may need an OPG radiographic examination done for your teeth to confirm the spread of infection or to rule out the exact cause of the pain nd accordingly treatment can be done.
i hope this helps ,