Why is depression so prevalent in Sikkim?

So to say, I am speaking out of my own experience resulting from the interactions I have had with other localites of Sikkim. I am a local myself, and depression, anxiety and mood disorders seem to be extremely common among my friends, relatives, colleagues. Does the weather have anything to do with it? It is so cold and morose all the time that it literally demotivates us from effective action. Or is it the political scenario that cripples? I have also witnessed several unhappy marriages, extra-marital affairs, dysfunctional families. We are a blessed and beautiful land but something just doesn't sit right. The suicide rates are also alarming. Mental health is tossed under the carpet.