Sorry for tmi, but over the past few weeks i've been having very strange bowels, it seems it goes from not being able to pass anything, then in the mornings having to rush to bathroom with loose stools. I keep getting cramps in my lower part of my stomach and like a burning sensation in the middle just below my rib cage. I keep feeling n* on and off, and this morning my stool has turned black..which made me pretty worried. Im going to the doctor tomorrow with my mum as she seems worried about this to, i know that stomach ulcers can cause black tarry stool, has anyone else had one before?..