I've been experiencing stomach distress for about 3 weeks. My doctor told me to take Zantac. That sometimes helps but only for a short time. Just about everytime I eat I get pains in my stomach and left side under rib cage. I get some sharp pains there also that don't last and are not frequent. My bowel also are not working real good. I took magnesium citrate and cleaned myself out pretty good last Friday. It is now Tuesday and I feel constipated again.