Thanks for asking the query,
I would like
to tell you that pain, swelling, prolonged numbness are common complications after extraction, you dont have to worry about that as they will subside after sometimes
. There could be a chance of some broken root piece left in the socket to rule out this you need to take an x-ray.
Take complete course of antibiotics and analgesics.
Take lukewarm saline
Take rest and follow the post extraction given by the Dentist properly.
Hope this helps out.