I have not noticed any triggers. 3 years ago during my last psychotic depressive episode, myself and everyone working to get me back on track, we could not figure out any triggers. It just kind of randomly appeared. What contributed to it was moving into a new school back then, and now it was triggered when I started college. The random lowered moods just seem to come and go, and the thoughts of death seem to follow the same pattern. So, I'm honestly not sure.