My sympathies dude. I prescribe more of what you like and less of what you hate, if that's possible. I'm 41 too, and that's what works for me. That and trying not to think about it
I find that trying not to think about something increases rather than decreases stress about that area. Only by thinking and thinking about it head on can I eventually come to peace with it. Otherwise I try to go into escapism and end up just feeling more crappy and tire to boot.
turning 40 sooner or later as well, for me a wakeup call did change a lot. changed job, workout again, walking whenever i can, avoiding sugar, being realistic about death, losing fears, etc.. sometimes i wonder, though, where the last ten years went...