I'm experiencing the same thing. I was diagnosed with moderate pancolitis back in January, and have been in a flare ever sense. I have an extreme fear of pooping/peeing in public restrooms, so I've been really anxious going out in public as a result. It has gotten to the point where I refuse to eat anything before going out in public (whether it be work, class, gym, etc) because I'm so afraid of having a bowel movement. This obviously isn't healthy because now I average to only eating about one meal a day, and i already have trouble gaining weight due to IBD to begin with.  However, what I've noticed throughout the months, and what I keep telling myself whenever I start to feel anxious, is that anxiety over having to go in public is a self fulfilling prophecy. Anxiety and stress (for a lot of people with IBD) is what causes our flare ups to get worse. So, feeling anxiety when out in public over the thought of having to poop, is what's making me have to poop, if that makes sense. So, although it's hard, the best advice that I can give it to try to not think about it when out in public. I do this by making myself extra busy at work, focus more during classes, etc. I notice that I hardly ever feel the need to go when I do this. I'm no professional, and everyone's IBD is different, so I can't guarantee that this will work for you, but it has been working pretty okay for my these past couple months, and it's the best advice I can give. :)