Realize that there are millions out there just like your loved one. They really are suffering with a potentially fatal biological illness. Their feelings are their symptoms. And their life really is danger. If people could stop it or feel better just by will or positive thinking, they would.
People do as much as they are emotionally and energetically capable of doing.
Without the right brain chemistry, a person can be physically incapable of forming a positive thought. Immediately People need to start some kind of treatment as soon as possible, even if they don't think it will help. Make sure they are doing SOMEthing for help. The sooner they start, the sooner the pain will end. Make sure they are taking what ever medications and vitamins they are supposed to be taking.