I have worked in a highly physical job for a number of years so learnt a bit about back problems and even went through some painful pain in my neck after being battoned by the police(grabbed from behind on the chin and tried to be pulled to the ground). It was based in my neck so controlled a lot nerves(pain) going into my head and travelled down my entire back. It was really unbearable but I continued to work for about a year on and off afterwards so I had this pain for about 4 years maybe.
I've also known people who have had back problems, usually the lower back or sciatica. When stuck within some painful back pain people often think that it will be there forever but this isn't usually the case even if it has been around for a while. The common approach that a doctor will tell you to take, unless you have a slipped disc or something that will require surgery, is to keep active while prescribing you with something like voltaren for the pain and inflamation over trying to huddle up in bed and rest it. And common sense like bending at the knees so not using your back like a crane.
I didn't really like the pills but a couple of things I found of comfort was having some creame to rub on. I think voltaren has one but I liked this one in a purple container that smelt a lot nicer.

You don't really say what is a serious back injury so I thought I'd write this stuff down so maybe it could help you.