you should try it sometime. 
usual times, the pain lasts or 3 hours, usually comes in the
morning (waking the hell out of me as early as 4am) and evenings
right during dinner time. you feel weak all over, lie on bed, cover
with blanket and hugging a pillow to the stomach. you dun even
wanna move an inch. breathing must be kept shallow if not it hurts
(wad can be worse than paining to breathe?? maybe paining to
blink??) the womb feels really tight, you can even feel the uterine
walls contract sometimes.
bad days, it happens in school, where there are no beds, no
blankets and no pillows. climbing stairs feels like scaling the
Everest. you can barely walk normally. getting up from seat and
sitting down from standing takes slow, planned, pained
motion.
really bad days its a really intolerable splitting pain down
there... and it throbs. whenever it throbs, you can hardly breathe.
no matter how hard u try to fight it, tears will come out.
sometimes, the pain is so intense that you cant even open your
eyes. in fact, you clench them.
and dun even get me started on Pre and Post MSs....