Stomach cramps suck

As if my body hasn't been through enough lately (triathlon, fitness test--rocked it, ITB issues, etc) it had to go & get sick this weekend too: stomach cramps, the works. One blessing was that I burped all night instead of puking all night. But those stomach cramps really wear me out. And why is it that I never seem to get sick during the day? It always seems to hit at night, so I'm extra tired. And once everything has "passed" there's the discomfort of my gut refilling & wondering if that's really all I'm feeling out if I'm going to have another round of it. I don't have time to be sick.