Surviving Without Medication: Mental Health in a Post-Apocalyptic World

This is a random question to ask but it is one that has been running through my head all day. Has anyone else wondered how the folks who have mental health disorders would do in a walking dead type world (or any world similar to that) without their medication or doctors to help them? Yes some may commit suicide for whatever reasons they may have, but for the ones that may actually try to survive and contribute to save those around them, what road would they go down. Would it depend on how dangerous it is for the person to not have their meds to determine how long they will live and if they stay good. I would love to see some kind of show, movie or even read a book about people with mental disorders being the star of a show like the walking dead, or any other post apocalyptic world.