Sub, Dude
This past week I've been making animations for robots, and have been working and reworking them until my eyes are spinning. Today I'm doing a small machinima job and nursing a weird back pain that comes in fairly painful spasms if I move wrongly.

It sideswiped me this morning, and I recognised the pain, which was very like a mystery pain I had for weeks a long time ago that was at least double the intensity. It arrived out of the blue and I couldn't move at all that night or it whalloped me - I sat up rigid all night and actually went immediately to the doctor's - no small feat (I must've had insurance then). She had me do more and more complex tests over time until finally she told me the next step was a colonoscopy, whereupon I told her I was getting off the bus as the pain was nearly gone by that point and the tests had yielded no information. That pain was more central - under the ribs - but perhaps it originated in the back rather than the gizzards. Or perhaps not. Only so many types of pain, I reckon.