Jeez, I woke up this morning, and my abdomen was screaming in pain... Felt like a C clamp was put on it and tightened severely. I figured my appendix was about to burst open or something... It went away later.
Turned out that it was stomach gas that had been compressed for a long time, and was in major need of being released. I hate it when the body just doesn't sense this shit and get it over with before it happens.