Please don't ignore as the pain has persisted more than 2 weeks. Based on your history, it could possibly be tonsillitis or traumatic ulcer because of the accidental bite in the posterior aspect of the tongue, which may have lead to inflammation/infection. Again based on just your history it's not enough to give an ideal diagnosis and treatment plan. It's better to get a clinical check up and then proceed with a proper diagnosis and treatment plan.
Next Steps
Kindly visit your nearest dentist or ENT doctor
Health Tips
Bland soft diet, avoid hot and spicy food, warm salt water gargle