My doctor prescibed Xanax for anxiety which is at the heart of my IBS-D. Unforunately it made me worse. It made me so jittery and it also had a very bad effect on my bowels. I didn't really have D, but I was going every 30 minutes all morning and some days even into the afternoon. I would think I was done, but within a couple minutes I started to feel like I needed to go again and pretty soon it was urgent. I thought I might just have to give it time, but the effects actually worsened. He told me to stop taking it, so now I'm back where I started. Anyone else have a medication do almost the opposite of what it was supposed to?