June_Bug,
I really can't put my finger on it. I know that I've had it in some form for the last couple of years.
It's just started getting worse in the past few months, though.
Job stress, finances, personal life - no one thing really stands out; more like just everything combined.

I've gotten a bit introspective lately, and started looking back on my life. Not a whole lot that I can honestly be proud of. Could be a part of it as well.

Probably just middle-age ruminations.....