This is how I spent mine:

Doped up on Morphine and a few other things I do not have memory of.

Started out with incredible abdominal pain, getting progressibly worse. We finally called an ambulance when my hands and feet started going numb, and I couldn't control the shuddering.

Turns out I have four kidney stones, the largest (4mm) of which was trying to pass down to my bladder. The other three are still partying in my kidneys. Guess I am in for a really fun week ahead.