There's a time and place for grace, and there's a time and place for a little bit of exhortation. If you had been lying in bed for months or years, constantly moaning about your pain, maybe your friend would have been right to give you a little nudge nudge. Even in physical rehab, therapists prefer to get a patient acting "as if" they are normal as soon as possible, even if there is pain.
When it comes to changing one's own mental outlook/attitudes/moods, if someone doesn't have faith that reaching out to take those painful steps of courage will, in time, "fix their back", then it most certainly won't be fixed.
When it comes to changing one's own mental outlook/attitudes/moods, if someone doesn't have faith that reaching out to take those painful steps of courage will, in time, "fix their back", then it most certainly won't be fixed.