It seems that you are having some ulcers on the inside of ur lower lips along with some throat infection.
Next Steps
Go and see a dentist for a better/confirmed diagnosis. He/she might also give u an antibiotic course to treat the throat infection.
Health Tips
Meanwhile, do warm saline rinses 4-5 times daily.
Also, u can apply zytee gel on the ulcers, 10-15 mins prior to any meal.
Avoid hot and spicy food.
OTC medication is not recommended.