My mom was an RN, I know it's a very tough job!

I don't know exactly what kind of nursing you did, but maybe you can find an RN job that is less stressful than your last one was. (Although, I have no idea what it could be!)

Maybe you can get in touch with some of your professional contacts, or a local university or college and see if anyone needs a good RN who can't quite work in quite the same capacity as most can... And remember, (this is something I have trouble with), just because you can't work in the same way that you could before the accident, doesn't mean it's not good enough.