I am a 47 year old woman. I had laproscopic surgery of a large peritoneal cyst in the left upper quadrant abutting the spleen, adrenal gland and upper pole of the left kidney measuring 1.5 x 9 x 13.3 cm last Thursday. Its now Wednesday a week later and I've been waking up each morning feeling really well. Incisions are healing and I feel much more mobile. However, ever since Monday, once I've been up for about 10 minutes in the morning, I get some abdominal cramps, diarrhea and pretty intense lower back pain on the left side. After an hour or two the back pain goes away. During the day a more milder pain migrates more to my front. Sometimes it returns to the same areas after eating but not always. I've had about one bout of diarrhea per day since Monday. Could this abdominal and back pain be coming from the CO2 my surgeon told me about used during the surgery? Could it still be trapped in my body almost a week later? Or does it sound like something else could be going on?