Hi and welcome,
You are suffering from acute pharyngitis
and infective tonsillitis , caused due to inflammation of mucous membrane
lining the throat, it is usually bacterial or viral infection.
Since you have been prescribed with medicines and your are responding well i suggest you to continue with the course.
Formation of ulcers and inflammed hard palate
, cold sores may be secondary effect due to dehydration
and dificiency of vitamins.
you can start with multivitamin
supplements or vitamin c lozenges for 5 to 7 days which heal up the ulcers.
Mouth gargling with antiseptic mouth wash like chlorhexindine will give soothing effect ,prevents infection and promotes faster healing of ulcers.
i hope this helps you, take care.