I am a very healthy 23 Year old female, i am very careless with my diet I eat what I want and when I want it, lots of candy and I mainly drink water an occasional soda every once in a while. I started having blood in my stool and it was bright, my mother in law was a nurse and checked for hemorrhoids and had no signs of them I haven t had blood in my stool since the 9th of this month and since then I have been feeling sick like stomach pains and feeling naussiated but never throw up, so whenever I eat the pains get worse and I immediately have to make a bowel movement , any ideas what this might be?