In the past month, I've experienced severe cramps twice. And I mean so bad, I was about to call 911. Soon after, though, the major urge for #2 comes and the pain subsides after I go. However, both times, I felt constipated at first, straining to go, but once the first few hard stools came out, it was pretty much all diahrea. Is this normal? Why am I experiencing such a severe cramp?