A perforated bowel would cause you constant and severe stomach/lower belly pains. On examination, your belly would be extremely tender to the touch and maybe possibly be rigid, rather than soft. If you can open your bowels, which you may not be able to, then you may be passing malena stools, this is frank blood in your stools. You may also vomit fecal fluid, but not always, as this is more indicative of an obstruction.
Normally, this would require urgent hospital admission. If you were medically managed, then you may have IV fluids initiated and a large bore NG tube put down your nose and into your stomach so that any backed up fluid in your stomach can drain into a drainage bag attached to the end of the tube.
Normally however, any kind of perforation of the intestine would need surgery to repair it.
Hope this helps?