So when should you treat a sore throat yourself, and when should you see a doctor?
Use this guide: unless it's unusually severe or you have other symptoms, give a sore throat two days. If your throat doesn't feel better within 48 hours, it's worth seeing your doc and getting a diagnostic test to rule out a bacterial infection.
Meanwhile, gargle with salt water to relieve symptoms. The salt can kill bacteria and numb the throat so you won't feel as much pain.