The pain may be due to Incisional hernia
occuring in the scar site.
Stump appendicitis will be diagnosed in CT scan.
Another possibility is Sub acute intestinal obstruction
due to adhesions .
Please come back with Colonoscopy report,i will further clarify.
Till then take Smooth muscle relaxant
like Dicyclomine,a Pre and probiotic.
As you have not seen your period,please Consult Gynaecologist also.
Wish you good health