I have self-diagnosed myself with Irritable Bowel Syndrome also known as IBS.
*I previously self-daignosed myself with Rectal cancer, but was proven wrong when the signs and symptoms went away when the stress went away.
In a nutshell, when I get stressed out (usually a week before an exam up until the actual day of the exam) I get this combination throughout the weak of either diarrhea, constipation, painful gas, small frequent stools, constantly feeling like I need to go to the bathroom, but nothings there... basically a bunch of weird GI stuff caused by stress. Disturbing this is, yes. I think this is what I do not look forward to the most about going back to school. I really got used to having normal bowel movements this past christmas break. The brain is one crazy machine.
You particularly are able to empathise with me if you are familiar with the filth that haunts all male public restrooms.