Thanks for asking the query,
It can be due to abscess
formation ,either a periodontal abscess arising from the infected tooth or gingival abscess due to accumulation of bacterial plague
and calculus deep in the gum pockets.
Draining of this abscess and pus in the oral cavity leads to nausea
, vomitting , halitosis
and stomach infection.
I would suggest you to go for complete clinical examination, get an x-ray done.
of the abscess is required.
Get complete mouth scaling and polishing done.
Take complete course of antibiotics and analgesic
Use saline water gargles 3-4 times a day .
Maintain a good oral hygiene.
Hope this helps out.