Atropine / diphenoxylate
"I am a veteran. I suffer from PTSD, severe anxiety disorder, agoraphobia (deathly fear of leaving my home), and within the last 2 years, IBS. My diarrhea was truly horrid. IBS topped with severe anxiety is unfathomable. I went through every test possible including CT Scans and multiple colonoscopies just looking for some reason, any reason, for the constant times spent literally in a panicked run to the bathroom. They didn't reveal a thing except that you are not immune to having an 'episode' just because you are in a CT machine; very embarrassing. I changed my medicines around and wound up with the opportunity to try Atropine without nasty interactions. It has not completely cured me, but it is by far the best I've tried, and, I have been on many medicines."