The best cure is the B.R.A.T. diet (as recommended by nurses and other health care professionals). Bananas, Rice, Apples, Toast. Think fiber because you're trying to stop-up your system. The mucus could be the jellos or soups you're eating. You don't want more liquids, you want fiber. Also, the pepto-bismol is what is making your stool black (in my experience). Try the BRAT diet for a couple of days and see if that helps.