I've had diarrhea for several weeks. It started after two rounds of Levaquin and prednisone for sinus and bronchial issues. I've had stool tests that have returned negative for bacteria or c diff. Today, I am experiencing upper stomach pressure and have no control of when a bm will occur. My stools are very runny and gassy and are also full of mucous. I saw an immunologist today and will be having more testing done, but didn't have the mucous earlier. What could it be a symptom of?