Light duty? Are they nuts? The worst thing I can do around my house is vacuum. That puts me down for days! (of course, my house shows it
Is your boss the one who interprets your MRI findings? Seems like a conflict of interest to me, but hey, I don't know if I've ever heard of a Worker's comp case that didn't have one hurdle after another, including my own (which was lost, and then I was later laid off).
All I can say it I can see why your back is getting worse with all those activities. Even shopping - especially if you're carrying groceries in and out. Is your PT in your corner? Because maybe they need to put you on "no duty" if that's light duty! Employers seem to want to run us all into the ground, and then toss us to the curb when we can't function anymore!
Ok, I'll stop my rant!
Please, try to take care of yourself in whatever ways you can.