I'd rather feel like my stomach was groaning than be overwhelmed 由 the sensation that there's something in my head trying to burst it's way out of my skull.
Stomacheache because when I have a headache I eat two Tylenol and go to sleep, but when I have a stomachache I don't want to eat anything and am in too much pain to go to sleep.
At least I can physically 移动 when I have a headache, and it's not the sort of pain that makes me bend over the whole time and makes my face screw up strangely. :L