Take heart. You've got very valid feelings. However, it's bad for everyone right now. If you think you feel insecure, try being a middle aged middle manager in this economy. Of course, just because somebody else has it worse is no rationale to say you have it good. Just saying, things are difficult and they always were.
You've got choices, you've got options. Get out there and hustle. Practice the law, even if you have to do it for free. Eventually you will build up a practice and a career. It's hard to be enthusiastic about that, now, but if you do, you'll see that this works. Not much else does.
As for the debt, yeah, that's a crappy situation. However, as the board's resident old fart, I'll say this: later in life you'll look back with some nostalgia at the time when you were young and the only problems you had centered around money.
Sometime in your life, I bet you buy a new car that involves a note that's as big as your student loan debt.
These problems you're facing are real and considerable, but surmountable.
Unless your undegrad degree was in petroleum engineering or some other highly marketable discipline you'd probably not be better off to have skipped law school. Just do what you can. Take one step at a time. One day at a time if you have to. Just keep moving forward and don't wallow in self-pity.
Good luck. You're not alone in this. You will come out of this strong and prosperous. Trust me on this: things will work out in the end. We just don't know how, yet.