About a year ago, one night I was having a headache and nausea so I just went to bed. When I woke up, headache and nausea were gone but every time I had a meal, five minutes later I had an explosive bowel movement. That went on for 4-5 days. After that, I started losing weight. I've lost 50lbs in 6 months. I am a male, 5'10. I went from 185lbs to 135lbs. I have been eating well but no matter how much I eat, there's always hunger. Before, my stools looked thicker, harder, compacted, and longer segmented but now, they are smaller segmented, thinner, and soft. More than 50% of time, I have some parts floating. Blood work didn't show anything obvious and stool test came back negative. What could this be?