How common is having rectal spasms. I describe mine as the "dry heaves" of the butt.. You know when you need to throw up and just heave . well my rectal spasms feel like that... spasms ...have to get to the bathroom yet nothin g comes out but some white mucus! How many of you experince this? I really hate this... interupts my day and constantly feel like I need to poop. Has your GI given you anything to help?