Help please, left sided stomach pain?

yesterday i saw my dr who said i probly have a virus and that i should rest and eat/drink easy stuff... i have had horrible cramping and diarrhea for 6 days, she wants to to drop off a stool sample to be checked for c-diff. but, while im not having diarrhea anymore really, im tired, achy, and the lower left part of my stomach, colon area, is KILLING me. i think im gunna go to the hospital- what can i expect while im there and what the heck is going on?! is this a perforated bowel or something, im scared!