Probably you may have sore throat
( throat infection
) with throat pain starting little late.
Sore throat normally have pain in throat, difficulty in swallowing, fever ,cough and associated headaches.
For sore throat you can take antibiotics like azithromycin
500mg once daily for three days
along with paracetamol
for fever as needed.
You should have warm water gargles.
Take hot liquids it helps in soothing your throat pain.
Regarding Nimesulide it has many contraversies. kindly consult your local physician before having it.