Imagine you're living inside a bathroom for more than two years. And that the confinement is self-imposed. Sound implausible? That's the reality of a 27-year-old man who shared his experiences with 48 Hours. 48 Hours provides a rare view into obsessive-compulsive disorder with a profile of David. Once he studied philosophy in college; he dropped out two years ago when his fears overtook him. A Cell of His Own Choosing: David confines himself to one room, his parents' bathroom. Why? He fears he'll contaminate others. His parents feed him flattened food that can slide under the door. His parents wrestle with how to best help him. Eleventh Hour Chat Dr. Michael Jenike answered questions about treatment options on a 48 Hours chat after the show at 11 p.m. ET. Read the transcript here. A Giant Step Forward: Sometimes progress is measured in small increments. In David's case, it's a question of whether he'll open the bathroom door. A Doctor Makes A House Call: Miles away in the Boston area, Dr. Michael Jenike runs the country's first in-house treatment facility for obsessive-compulsive disorders. If David can't go outside to come to him, Dr. Jenike opts to visit. Not Clean Enough: Helena is obsessed with her own fear: that others are dirty. That is why she shuns her elderly mother. Can Dr. Jenike's clinic help her? Trapped In A Basement: Another one of Dr. Jenike's patients struggled with a need to confine himself - until he had a breakthrough. Find out how Ed Zine wrestled with his obsession to stay in the cellar.