Thanks for asking the query ,
As described by you , your tooth is badly carious and the infection had spread to the surrounding periapical tissues . You need to visit to the Dentist
and get check up done .
Take an x-ray of the tooth .
If you delay the treatment the infection will further spread to surrounding jaw bones spaces leading to space infections.
At home take saline water gargles 3-4 times a day .
Maintain a good oral hygiene .
Use 0.2% of chlorhexidine
mouthwash gargles twice daily .
Take tab Flemiclav three times tab Dolonex
three times for 3 days .
Get complete mouth scaling and polishing done .
Hope this helps out .