I had left upper abdominal pain (more dull or soreness feeling) it would come and go sometimes weeks in between. Months ago I went to the bathroom and noticed black olives in my stool (never had a problem before). Jus a month and a half ago I started having dull pains down my left and right side, pressure in my lower back and my stool would range from green to light brown to darker brown, they would go from loose, thin and hard, short, diarrhea. I went to the dr, he gave me Bentyl for my pain and azythromycin for diarrhea. I took all the antibiotic which relieved all my back pressure. I still take the Bentyl but idk that it was working or what but now I have a lot of mucus when I got to the bathroom, which I first thot was jus diarrhea till I looked closer and it was actually mucus with a little bit of stool. I have lots of gas, still have undigested foods like onions, lettuce, black olives, peppers. It also has a fould odor. I haven't had a formed stool in a week and haven't had a decent sized formed stool or normal stool in a month and a half. What could be going on?