I am a 23 yr old female. I am worried about possible blood in my stools. I have constipation for several days and then diarrhea for a day or two, then the cycle restarts. The diarrhea is watery-green and looks like I dumped dark brown sand/dirt in the tiolet. It doesn't look black like coffee grounds, but brown like dirt. Is this blood? I also (most of the time) have a moderate to severe cramping pain in my left side during these bouts of diarrhea that go away immediately following. I had my gallbladder out four and a half years ago following the birth of my daughter. Since then I have had another child. I take Wellbutrin XL 300mg/day for depression and I have the mirena for bc. Otherwise, I am a healthy person. I am finishing nursing school this year, and I realize that this may be something to worry about. I would appreciate your help! Thank you.