The Boss
Ya know, that hacks me. In my past, I've been asked to (and agreed to) work 2 full-time positions, including taking on senior management duties in a global org in a different area of professional expertise (simultaneously with being a first-line supervisor in my "real" field of expertise); I've also worked 90+ hours for months at a time. I'm against neither hard work nor long hours when needed. In both these cases, the need was real. (Gulf war.) Important things got done; less important things got done when possible. And in both cases, management was very reasonable about less-necessary things slipping.
In these cases, II'd acknowledged the working assumption was a not-completely-insane boss. At least we now have evidence supporting the idea that the assumption of common sense and decency was weak... :x
So, my second set of recommendations:
1) Project: "Find new job" (I'm not being flip; marketability is your best defense)
2) Project: "Buy and read James Loehrer's 'Stress for Success'" (Again, not being flip. This is one of the 3 best books on stress out there; the other two are "Margin" and "Overload Syndrome" by Richard Swensen, but they won't help you as much in the heat of this particular battle.)
'Luck.