welcome to heart care magic family,
from your history it seems you might have attach of acute appendicitis
.long course of antibiotic might suppress the symptoms but now it is possible that pus is formed and localized to fix part,mostly underneath the appendix
.there are all chances that there is rupture of appendix.
of course,these are the possibilities i conclude from history.
without waiting for appointment of gastroenterologist,you immediately consult surgeon.