You are suffering from tonsillitis which is pretty common in young age. Start with warm saline gargles (add two teaspoons salt in a glass of warm water) three to four times in a day. Also you start with ofloxacin200mg twice daily for five days and tablet ibuprofen 400mg three times daily for five days.
Next Steps
Alternatively you can visit a nearby physician
Health Tips
Avoid cold, spicy and sour things. Take lot of hot liquids like soup, hot milk/tea/coffee etc.