I hope you're right. My appetite hasn't been good, and an ant-acid cleared up the burning.. I feel absolutely no pain though,which leads me to believe that I don't think it could be THAT serious. Hopefully not.
Our stool color varies in color from light brown to dark brown, depending on what we eat.
I wouldn't be concerned at all about this, but if the burning gets worse, then I would see your doctor regarding that. Considering your age, I think you are fine. It's good to be pro-active with your health, but don't worry so much that you get obcessive with it, this will just create more problems for you. I wish you all the best and take care.