it sounds like diverticulitis to me. It could be an ovarian cyst (not life threatening, but can prove serious if it ruptures) But the diarrhea and constipation seems like diverticulitis.
I would get it checked out immediately.
The abdomen pain sounds like it might be a ruptured ovarian cyst- I had one two years ago and it was very painful, although it was extremely acute and dehabilitating. I would see your gynocologist to get checked out.