The symptoms could be due to quitting
smoking. However, they can also be due to viral fever as you have
sore throat, cold, difficulty in swallowing, and while particle (pus) on tonsil.
You can drink hot chicken broth and soup, warm lemonade, ginger and honey concoction. You can do warm saline gargles (gargling with warm water in which a pinch of salt is mixed) and apply vicks vaporub over your chest, throat and forehead/nose.If this does not help, please consult a doctor.
Take care!