I'm 17 about 5'3 and 103lbs. I have a burnt taste in my mouth and a weird burnt smell in my stool and diarrhea pretty much everyday. The burnt smell in my stool is also on and off, but has been there for a while this time, about 2months. The burnt taste in my mouth has been off and on, but has been ongoing for about a week and a half now. I've had stomach problems before, but my doctor never knew what it was, so i changed my diet to a healthier diet and my stomach didn't hurt anymore. What could it be?