I remember those days ! I have a touch of arthritis in my right shoulder, and the way I was shown to get out of bed was to roll onto the right side, and dig the elbow i . . . I think I strained every muscle in my back at some point the first few weeks home. I rmember crying from it, not so much just the pain, but the unfairness that my back hurt worse than my chest did, and was holding me back from doing things.
One more word : ROBAXACET - it has a muscle relaxant as well as a painkiller, and helps me sleep when my back bothers me (I have had a bad back since pulling muscles when I was about 15 years old). If that doesn't work, try MIDOL or some other menstrual cramp med, they have muscle relaxants, too.