Hello I m 19 and overweight, I smoke marijuana and drink twice a week or less. Recently I ve been experiencing constipation whilst my stomach gives me a poop cramp. I manage to get small pebbles out, and I noticed small streaks of red on the poo. No residue on toilet paper. On an offnote, my stomach gets random burning sensations and I vomit fairly regularly especially after I eat from acid reflux which i ve heard could cause ulcers Earlier this week I had a scare about black stool after a night of dark beers. What could be going wrong? Do I have severe internal bleeding? An ulcer that s bleeding? Is it safe to consult a doctor tomorrow? I m terribly afraid of bleeding out.