Dear Black dog black~
Life can be very unkind and hand out unfair burdens, with no easy way of making things better. Having depression and anxiety are bad enough by themselves without the limitations of a spinal injury and constant pain. Plus panic attacks are the pits.
I guess trying to deal with your back is one thing, I know you are on pain-killers, actually I am too for a similar problem, though I'm lucky enough to only need the realy strong ones now and again. Can you do exercises? I can get out, though can't walk that far. You said you don't get out much, but it is the anxiety and panic attack stopping you.
In a way that is good, which might seem a funny thing to say, however those two can be coped with, allowing you a better life. I may sound unrealistically confident to you, but I've improved out of sight. It took time, meds, therapy and a lifestyle that took these illnesses into account, but tried not to let them rule.
Are you facing all this alone, or do you have anyone to care and talk with? I had a partner and it made a big difference.
I am not trying to make your problems seem small, just trying to let you know there is hope
Croix
