Yesterday I had the runs all day. Non stop and few this morning. Tmi ik!! But now starting at 731pm then 751pm, then again at 811pm I had this sensation or urge to go poo again. Nothing came. My stomach hardened and lower back hurt so bad it triggered my sciatic nerve and lasted 60-90 seconds each time. No matter what position I tried they still came and felt worse than the last. Should I be concerned? What is this?