Hi, I have been on acid refulx treatment, in my third week, first week i made dietary changes, the second week i started taking zantac which didnt help, now i am on pantoprazole for the 5th day, it doesnt seem to be helping i still have constant breathlessness through the lungs and today i noticed really dark, i would say black stool. whats going on pl help? i can;t breathe i can t eat properly.