Based from the information is seem that pain is mostly due to the stretching of the fibrous tissue around the area.
The healing occurs with fibrous tissues which are tough then normal cell, so that the joint / healed portion can stay connected to the main part. But in some cases the over formation of such fibrous tissues may lead to sensation of pain as they are bit rough, or may have some other connection and leading to stretch causing feeling of pain.
1) Consult your surgeon and explain what is going on.
of abdomen may help to find out any abnormal connection formation after the operation was done.
Hope i have addressed you concern satisfactorily.
Dr. JAY PATEL.