If you had internal bleeding your stool would be bloody or black. Keep in mind that when you look in the toilet the color of your stool can be somewhat distorted by the water especially if there's urine in it. I read your other post and from what your saying your stomach problems could be from some type of acid reflux. I never had and don't have any of the common symptoms such as heartburn, gas, frequent burping, etc. but I had a warm almost burning feeling in my throat that went away with eating, nausea (never threw up), some abdominal pain on my sides, pain either on or just under both sides of my ribs (lately just the left), etc. Had these feelings for almost 2 months since I developed a sinus infection. Sinuses went away but still had all these feelings along with headache. While I've never been diagnosed with GERD or acid reflux I thought I'd try Prevacid this morning and even though it takes between 24 hours to 4 days to start seeing any results its been about 5-6 hours since I've taken my first pill and I haven't had any of the symptoms minus a little pain around my left rib which could easily be from the way I sit at the computer. Even my headache seems to have disappeared. I don't know if the Prevacid is actually working or if it's just me believing it will work so it lowers my anxiety thereby lowering my symptoms.