Hi... Welcome to healthcare magic. As you mentioned you have problem of abdominal cramps with yellow mucus stool that may be because of gastroenteritis or intestinal inflammation condition or other reasons. Liver or gallbladder problem also lead to more bile salt in stool cause yellow stool. Consult a gastroenterologist for further diagnosis. Abdominal ultrasonograph is helpful to you.. Detail history and investigation helpful for diagnosis. Start a treatment as per reason behind it.. I hope this will help you. Get well soon.. Thank you.