What Causes Pain In Lower Abdomen During Defecation?

Hi I Was In The Shower And When I Got Up And Immediately Felt Like I Had To Do A #2 So I Did One . But Then The Pain Started I Felt My Stomach Crouch Up And A Pain In My Lower Stomach . When The Pain Stopped I Had to #2 Again I Did It And Then The Pain Started I Feel Like I m Dying Help Me . What Should i Do