This is more circumstantial however, as my trigger at the time was accumulating too many perceived responsibilities and fearing failure. To be honest I feel the triggers are nearly irrelevant, but removing myself from them gives me enough temporary relief for my body to get out of stress mode. Which in turn removes some of the depressive overhead to give myself a golden window of opportunity.
I've been wondering lately if there isn't a model of care that goes beyond just a psychiatrist (to prescribe the meds) and a therapist (to administer therapy along with the standard advice about exercise and eating well). Something more like a "nanny" or a caretaker who could help the patient with those things: bug the patient daily to make sure they're taking their meds (and/or supplements, if you're going that route); buy and cook that nice healthy food; get you out of the house and into the gym; etc. Something more than just seeing a therapist once a week, but less intensive than any form of institutional care (even on an outpatient basis).
Asking for a friend... :(