Sotto, I'm sorry to read that your back is hurt. Take things slowly for a couple of days, i.e., no twisting or picking up heavy things. You probably pulled some muscles that stretched a bit too much in the process of packing, etc.
Give yourself some time. Returning to the marital home was a step back in time to the place where your journey began. It's understandable that it rocked you a bit...you'll work thru it and be back up and about again in a while.
Take care of yourself.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.