I hear ya, friend, and share your pain. This summer I submitted over 100 applications and got three interviews.
I have a similar resume and have been limping along on temp assignments for three years now. Fortunately, the missus is tenured at the public school so we are staying afloat but not gaining at all. I'm now doing part-time at the local Walmart just to keep my ex-wife's lawyer pacified. I refuse to consider "insurance customer service" or "financial advisor" (i.e., sales) -- I just don't have the temperment for it.
The Accountemps division of Robert Half has done well for me, off and on given this Central New York economy, but they now tell me the recent shocks have frozen the temp market. Robert Half professional placement has done nothing.
This is not my first trip through this sort of adversity. It is a challenge to stay positive and to keep plugging, but you have to maintain the effort regardless. It helps if you have some hobby to consume a few of your idle hours; I got into community theater. Getting applause kept my spirits up, and it's possible to do some networking. At a minimum, consider singing kareoke now and then. It's a way to meet talented people.