What Causes Tightness In Upper Back And Lower Back Pain After Injury?

I injured my low back two days ago which is improved today but I can only tolerate short periods of time in any position . I m a nurse, I took one day off and I was wondering if another is would be nessesary. I plan to see at chiropractor and would like a massage if recommended. I have tightness in my upper back and pain in my lower. I can somewhat sit today compared to the last two days. Any recommendations or suggestions?