I have read your question,
There is nothing to worry in your case , actually the pain may be due to flu
I recommend you to not to eat sour /spicy foods, and take antibiotics, with anti-inflammatory and anti-histamine
tabs , to control flu and pain,
sometimes can be due to acidity as well , Since you may be taking the prescribed drug on an empty stomach this problem could also arise , in such a case I recommend you to use , antacids for relief,
In any case if the problem persists I recommend you to consult a nearby physician for further guidance.
Wishing you a good health,