Mind you, I am not a psychiatrist, or any of those other professions that are hard to spell, so this is just my opinion.
I think depression is often a feeling of hopelessness, helplessness, or uselessness.
"Things can't get any better...I hope they don't get worst...but they probably will." sort of feelings.
I honestly believe that living in a permies environment
with active permies could be a road to recovery, a cure.
Planting seeds, nurturing a plant, and finally eating the bounty brings great anticipation and hope...
...things that are often missing with depressed people.
Gardening is an easy task that brings great joy - a sense of fulfillment.
Growing everything one eats is not easy, but growing some of it is easy. It's a step towards fulfillment.
(Start with something quick and easy like radishes {+/- 30 days}, and by the time they are ready to harvest, you will be seeing your other crop plants maturing. The radishes will help build confidence that your other plants will reward you soon.)
The same thing for animals. Knowing that they partially depend on you gives a feeling of being needed/usefull. After days of feeding and watering, those eggs you take to the stove will have special meaning to you. As the days progress, you will welcome new challenges.
You can be anything you want to be. A
permaculture environment will show that to you.
You would be amongst a group of dreamers who are celebrating each dream that comes true through work and effort.
Ready for the next challenge.
Being surrounded by permies will open your eyes to all of the things that you
can do for a more rewarding life.