Thanks for asking the query,
is the antidepressant drug, and discontinuing this draug has a high risk of withdrawl effects.
It can be due to reaction to the drug but correct cause will be diagnosed on clinical examination.
I would suggest you to visit the Dentist
and get the thorough clinical examination done.
Go for symptomatic treatment of complete mouth scaling and polishing.
Take lukewarm saline and antiseptic mouthwash gargles twice daily.
Maintain a good oral hygiene
, avoid eating of hot and spicy food stuffs.
Hope this helps out.