Hi thanks gor your question.
Your having pain at right side of abdomen below the umblicus and this pain is aggreviated with walking and standing.All these are features of recurrent appendicitis
.Your physical examination during attack of pain will be helpful in diagnosing the cause of pain.I would suggest you to consult a physician who will be able to examine you and investigate you for abdominal pain
.Besides other investigation you may need ultrsound abdomen to establish the cause of pain abdomen
Hope this answers your question.