Addiction and the Slow Death of Dopamine

An unidentified person wakes up in an alternative reality, a reality created from the sources of the person's addictions. It is bleak, dark and lonely and an unwilling decision is made, to walk through it until an exit is found. The protagonist wanders through the realm and experiences many serious physical and mental trials that would normally break a person, even kill them. The protagonist's determination for life alongside desired answers about the world and why they're there keeps them alive and walking until something's discovered.