Karel, from a physical standpoint, I think it's great that you do will do chair exercises which will help strengthen your upper body and even relieve stress. And it's encouraging that you are able to walk half a block using your cane. When I broke my hip a few years ago when I was 69, I wasn't in a wheelchair but I had to use a cane for about 6 months and I did as much walking as I could. (I found that an alternative to walking with a cane was to walk a bit around our local grocery using a small shopping cart to help steady myself and for some reason I felt less pain walking with that cart than when walking with the cane.) Something else you could possibly consider is going to a local Y or fitness center for swimming/floating/and or exercise classes. I know swimming doesn't or might not build bone but it's good for cardiovascular and that's important too. I'm so sorry for your difficulties and pain right now and I hope that in time you will experience less pain and more healing.