AaronM:
Around 15 years ago I injured my back and now it causes me tremendous pain to move around in any way.
The stress, ridiculous levels of pain and sudden sedentary life I now lead produced around 60lbs of visceral lard. I don't even look fat....more like very full.
I'm totally not a gainer and my body is far too weak to hold all this weight. I hate my new self, tremendously regret my avoidable injury and feel like every particle of my being is rotting like a zombie due to nerve pain.
Not exactly a happy story, but well...there we are....
Do you have any pain management care? Physical therapy, occupational therapy, medication, etc? It should help with the daily pain.
Water based exercises are good for people who have mobility issues. It's low impact and the water gives your body some support.
If you can stand it, having daily walks will help. Push yourself, but not to the point you can't stand it.
Also, if you haven't looked into it, get a nutritionist. Or at the very least cut out processed foods from your diet.