I wasn't so familiar with "Weltschmerz" in German.

It's actually an antiquated expression, I suppose... dates back to the early 1800s; perhaps used more in literature for illustration of certain feelings than in practical life. Lately, it seems to be resurfacing, perhaps a reflection of a world that seems increasingly messed up.

It definitely is good that depression is talked about and not just swept into a corner and ignored. I grew up in a family where feelings were seen as weak and stupid, and you just needed to focus on practicality and productivity. We had lots of alcoholics, drug users, gamblers and abnormally many suicides, for a family of our size.