Several weeks ago I had a lot of pain in my lower abdomen and was kept in hospital overnight for tests to which they found nothing. The past week, pain has been off and on, my bowel movements have increased quite a bit but are not soft, however, there has been something in every movement. About a week ago, it started when I had a very dark green bm and then after that there is what seems to be sort of like a broken up chalk like substance in them...every time and once in a while still some green. What is wrong with me?