Hello,
Welcome to the ehealthforum and I am really glad to help you out. Your concern is regarding the pain that you are having on the lower right abdomen after the appendectomy. The first possibility that is common after an abdominal surgery is adhesion formation in the abdomen. This can result in dull to severe pain at the site of the operation.
We also have to rule out other medical causes which may arise independent of the operative procedure. These include bowel obstruction, ovarian cysts and pelvic inflammatory disease, irritable bowel syndrome , kidney obstruction or pyelonephritis, psoas abscess and volvolus (twisting of the sigmoid part of the large bowel on itself).
Investigations like ultrasound abdomen, CT abdomen and colonoscopy are required to confirm a diagnosis. Please consult a gastroenterologist and get it examined.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care.