> A person doesn't get better from a visit, they get better by being left alone with medicine.
A possible rephrasing of the sentence above would be that, putting someone suffering from a protracted disease into a solitary confinement with medicine is the path to betterment. I don't think it works that way. There is a reason why even otherwise healthy person are not held in solitary confinement unless as an act of (sometimes disguised) punishment.
You mentioned that emotional health is an elusive concept. It is not, it can be measured, and the measure stands up to a quality that is acceptable to the disciplines of empirical sciences. I think your hesitation to acknowledge it, stems from the fact that it can be defined significantly by the person/patient, while that is true, it does not make it elusive. Many people can voluntarily control waves emitted by the brain. The fact, that brain signals can be so controlled, does not make epilepsy a fictitious condition.
>Depending on others to feel good is not the sign of a mentally healthy person.
EDIT: Responding here to prevent deeply nested threads. By your standards most humans would be unhealthy. The need for social interaction is well documented, and not only among humans. I am an introvert so I get by fine with a level of interaction low enough that it might bother someone else, but that does not mean that those who need it are unhealthy. There is a full spectrum and both extremes are considered deviant.
>I thought it was apparent that social interaction shouldn't be necessary to get better.
EDIT2: I think that's the crux of the argument/disagreement.
Social interaction has been deemed a necessity to well being. Can someone not recover from a disease without interaction, sure some can if it can be cured in a short enough duration, no otherwise. Does everybody need the social interaction to get better (stay well)? No, a percentage can do without it. In fact some spiritual school of thought see that to be the ultimate and difficult to attain target frame of mind.