Was scheduled for an endoscopy and colonoscopy on Monday, Feb 28. A few days before tests, I felt hungry but was only able to eat a few bites, then was totally full. Early Sunday morning (before taking any prep for tests) I started out with complete fluid bowel movements....watery all day - like I had already started taking the prep. I started prep at 4:30 PM on Sunday and took the other half at 9:30 PM on Sunday night. Endoscopy went well (get biopsy results back tomorrow) - colonoscopy couldn't be finished as I was in too much pain (wasn't put to sleep) - doctor said he had to quit because on level of 0-10 my pain was an 8. Since then, stomach pain, gas, etc., which I think is normal. But for the past two days, my stool is white and smells horrible! What can be the cause of this?