My other symptoms include:
1. Abdominal pain that focuses on the left side but moves around entire stomach
2. Mid back pain focuses on mid left, tends to be when abdominal isn't hurting
3. lots of gas
Stomach gurgles a lot
4. Stools tend to be orange brownish
5. Mild headaches and fatigue

I would agree that it could be undigested food if it didn't have what looks to be a "cord" attached to it.