The symptoms are associated with impacted wisdom tooth
which is erupting.
I would suggest you to visit a dentist
and get check up done.
If tooth is positioned normally,it has to be saved,or else get it extracted.
Gargle frequently using warm saline or betadine
Rinse mouth after every meals.
Take complete course of antibiotics-analgesics prescribed.
Maintain oral hygiene
Please do visit an oral surgeon for further reference.
Hope this helps.