I thnk Morgoth has some good points. I was only suggesting that what you were thinking might be an explanation, but there are so many other factors that need to be explored with your doctor. One thing is that maybe you can start working on learning to relax a bit and i know that's easier said than done. Almost all of us here (myself included) struggle with some depression and/or anxiety whether it's ongoing on periodic. That's normal. I don't know if you do anything to relax but you said it yourself - your mind needs a rest. Calming music, guided imagery CD's, a walk on the beach, a warm bath, your favorite tv show... and maybe even some meds. on a prn basis.
I know you don't like the thought of taking the vicodin. Again, the overwhelming majority (I'd say pretty much all of us!) on this board don't WANT to be taking the meds. we're on, but we're struggling to make peace with the choice that it's the meds or the pain, unless you're lucky enough to find another resolution. And those people probably aren't posting here. So join us not only for information, but for support as you struggle with the psychological end of this, too, because we're right there with you.