It took seven years for Rachel Levasseur to find a treatment that worked for a complex form of obsessive-compulsive disorder, which creates the persistent belief that she’s a harm to others. In the interim, she attempted suicide numerous times. Things changed last year when Levasseur’s parents reached out to a therapist at Sheppard Pratt, a psychiatric hospital in Maryland. The hospital’s self-pay, residential treatment program — called The Retreat — connects patients to a personalized care