Thanks for asking the query,
According to your clinical history i suppose that there can be a chance of any broken root piece left in the socket causing infection or presence of dry socket
to rule out this you need to visit the Dentist
and get an x-ray done, any left over root particle can be removed surgically.
Take a course of antibiotics and analgesics..
Follow the post extraction instructions properly.
Take lukewarm saline and antiseptic mouthwash rinses.
The periodontal abscess
when drained in the oral cavity leads to nausea
I would encourage you maintain a good oral hygiene
and after the pain and swelling subsides the root piece can be extracted.
Hope this helps out.