I don't think the "why" part is settled, tbh I mean like he said it could be some of THAT, but it sounds like others things are at play too. While it is indeed the worst period, do we give it longer to see if it's permanent?
But trust me, I'm in a better place than I was 5 days ago. I'm just starting to see through the facade that this means more in life that is perpetuated by overexposure to this forum. You get exposed to a perceived negative long enough you start to believe it objectively is and life is worse because of it.