My back bothered me about this time in recovery, too. I also consciously thought about my gait. My extension was a little more than 10 at five weeks. This week, it was zero, and I didn't work too hard in any specific way to achieve that. For the first few weeks, I slept better than before surgery, but I'm sleeping about the same now. I wake up every couple of hours, turn over, and (usually) go back to sleep. If I don't, I read for a little while until I am tired again. Sleep has bothered me periodically throughout my lift, but, mostly, I figure I will sleep when I'm tired. If I can't sleep, I either read or get up and do something until I can. I realize other people have serious sleep issues, and I don't want to minimize those, but I've found worrying about it seems to make it worse. Your mileage may vary.
I guess I'm lucky. I've had no friends or visitors (all my friends live hundreds of miles away or more). My husband, on the other hand, stopped doing the bare essentials pretty quickly after I got home. I found a way to scoop the litter boxes, load the dishwasher, and do the laundry in short stints (after telling him if he wanted his laundry done, he'd have to bring it downstairs, which he did do). Everything else? It waited. I know you'll find a way to get that stuff to balance out, but make sure you look out for you first for a little while more.