Hi thanks for asking question.
Mostly you had suffered from viral infection like that of
pharyngitis with
sore throat.
Because of this infection itchy sensation and stinging sensation can occur.
Second you may feel lump because of enlarge
tonsil.
Here is some advise for you.
You have completed antibiotic course.
Drink more and more water.
Take semisolid diet for few days.
Fruit juice helpful for you.
Avoid spicy food for few days.
Avoid fatty and fried food for few days.
Avoid
smoking and alcohol if have habit of it.
Do salt water gargle every day.
If still congestive symptoms are more then antihistaminic like drug can be taken.
If feeling blocked nose
oxymetazoline like decongestent used.
Take steam inhalation once a day for 10 to 15 days.
I hope my suggestion will helpful to you.
Wish you good health