Alas you live in a society so prone to litigation that no one will take on a tough case like yours; you must just suffer, right!
It's very difficult for me to give guidance, except in very general terms. Clearly there are signs of spinal cord damage too. Has anyone every mentioned INCREASED reflexes in that right leg?
It's now 18 months since the accident and you must start to exercise. Do whatever you can; perhaps some gentle swimming; try different strokes and see what works for you. Let pain be your guide; no pain, but there obviously be discomfort.
Then I would start doing some very gentle lower back exercises before getting out of bed every morning; just pull the knees to the chest and do a few pelvic tilts.
As far as able, go for short walks, even if it's only around your home. Unless you are moving, a sedentary life will start to affect your other organs, weight, blood pressure and so on.
Become a health nut; just start to avoid the stuff that you know is crap and focus on fruit and veg, and unrefined starches; eat the food your grandmother would have put on the table. With you being so inactive, your weight will increase, and your blood sugar; you don't want to become insulin resistant on top of all your other woes. No colas whatsoever, and all the surgary things. Perhaps bake your own bread if you can find 100% wholemeal flour. At my other site, bernard-preston.com you'll find plenty of help with dietary issues.
There IS danger of any sort of manipulation of your ribs; I wonder if an activator wouldn't help? It's a more gentle form of manipulation.
A daily massage of your chest would be a great help, focusing on the muscles between the ribs, and the joints at each end, at the sternum and the spine.
Start looking for a chiropractor who is gentle and has the time to work with you; as you say, this is with you for life, and you need to find someone you can trust, and whom you can assure you won't sue the pants off him or her!
Behind a terrible accident like this, there are hidden benefits and blessings; find them. Like are you a writer? Or... who knows what?
I wish you well, and hope these general thoughts will help. I'm a Christian, and believe that out of tragedy of this nature, there is blessing to be found. Perhaps start reading your Bible, if you've never done that.
Keep in touch.
Dr Barrie Lewis DC