About every three months or so my body just feels the need to not let me eat without feeling sick and get diarrhea. Like I have to constantly be in the bathroom bc it just hits at any moment. I'll even have the urge to go but can't. I can't even eat because it literally goes straight through me. I already have trouble holding weight and every time this happens, it usually lasts for a week, I lose 8-14 pounds easily. Does anyone know why this happens or does it happen to anyone else?