after eating may be related to infection of colon usually by amaeba. hence you may need stool examination for ova and cyst. you are also telling pain around appendix
possibility of appendicitis
can not be ruled out. for this you need ultrasuond abdomen. if it is amaebic colitis
antiamaebic treatment is suffice. if it turned out to be appedicitis you may need laparoscopic appendicectomy.