Dear jennifer, symptoms you re describing are very serious and it sounds like an acute/subacute intraabdominal disorder caused by inflammation. The pain type that you have is significant for pancreatitis
so check amylase
blood/urine level first. Also it can be gastric problem(ulcer, GERD) but also a variety of pathological state. Chills
and fever are classic signs of infection and inflammation and every time you have it go to hospital immediately. It need to be treated by intravenous antibiotics and the source of infection must be found. You should repeat your CT scan
and inflammatory markers
till you have clear diagnosis. Each surgery procedure including c section can cause infection and abscesses formation in pelvic and abdominal cavity. These collections can be drained percutanously or surgically. If CT cant find the pathology then you can do laparoscopic examination but this definitely need to be evaluated.
Wish you good health, Dr. Ivan Romic (Rominho)