Doc, I have a student who is a great pilot but has a "nervous stomach". Sometimes just taxiing out, we have to turn around so he can use the bathroom. We've had to come in on a haul ass basis so he can use the bathroom. He says he gets so nervous/excited prior to flight, it makes him have to go. He's tried Pepto and Immodium prior to flight. Sounds to me like he has maybe a little IBS but apparently during the day or when he's not flying, he's fine. He told me that real greasy food really messes his stomach up so he avoids it the day of our lessons. Any thoughts or suggestions?