Sorry to hear about your injury. After almost a year into nursing, I had a terrible shoulder injury that required surgery, and ended up being a torn rotator cuff. (I was 24 at the time, way too young for that injury!) I was in a sling for about 5 weeks, and still in so much pain when it was time for me to start back to work. Anyways, I felt a lot like you do... I was so scared to go to work (in the ER), and my orthopod told me if I injured it again while it was healing, I would never work as a nurse again. I can't explain the tears and torture it was thinking about it, but it seems you may have a good idea already.
Bottom line, I did some real soul searching and decided I needed to change jobs, even if it was something I didn't love, just so I would still have the ability to do something I loved in the future. I now work in peds and i LOVE LOVE LOVE it. It was the best decision I ever made.
I'm telling you my story because I want you to know that even if you switch jobs or postpone going back, or whatever you need to do, dont feel like it is a failure or worry about what others will think. You have to do what is best for you and your future. Also, who knows, you may actually end up loving what you do. Good luck to you, hope it works out.