Sounds to me like your going to have Tonsilitis or you already have a mild case of Tonsilitis. Antibiotics might help a bit but not all the time. If you start getting a white coating on your tonsils then it is Tonsilitis.
Try gargling with salt water every 1-2 hours. Tastes pretty "salty" lol but it helps some hun.
Dont worry about cancer. It sounds unlikely to me.
You could ask your doctor for a strep throat test and have some swabs taken to determine what kind of infection is present in the tonsils. It might clear up in about 2 weeks. If it doesn't go back to your doctor.