I studied Cognitive Psychology and Motivation at University. Depression can creep up on you over time (Chronic) or it can happen all of a sudden (Acute). What often happens to people is their depression chases their friends away and they are left alone. We are not programmed (most of us) to be around people who are burying themselves in self pity. Here is a man who has physical health, long term work experience and has potential to land a good job back in his country! There is strong possibility that he was already suffering from depression and anxiety issues before he came to the Phils. And he was prone to drinking alcohol. Alcohol has a bipolar effect on the brain. Euphoria initially and then often depressionogenic tendencies usually follow. Too make matters worse many people who suffer from depression sleep allot and are not motivated to exercise. Yes, exercise can help you fight depression! The key if you are trying to help a person suffering from depression is to get them up and moving! Maybe give them a puppy to take care of. Anything to stop them internalizing negative thoughts. The question is how do we help someone like this break his negative outlook on life to something more positive? He was likely a very nice man who just could not cope with life. I think there are lots of lost souls who are like this especially with our Western Culture where success is defined in terms of having lots of money and a good job!
The Philippines is about the worst place you can be if you have a chemical imbalance or mental illness. It is far too easy to fall deeper into the hole with drugs (alcohol) and destructive behavior. It is very unlikely anyone is going to stop you from destroying your life. Most locals are going to see you as "just another *sshole long nose" and most long noses are going to see you as toxic (and won't want to be around you as your unpredictable behavior may make yourself a target of revenge from locals you have pissed off).
