I feel so badly for you right now. 
Shoes are one of those things which are so difficult to get that happy, 3 way medium between what we want to wear, what feels comfortable and what is practical.
It's not as if any worht wearing are cheap either.
Best of luck Cindy. Just a small thought. I recall, many years ago, a dancer claiming that when we slip it's because of how we are walking. He claimed that the worst mistake most people make is to move forward before their foot has a proper grip. Just some thought. 
But whatever Cindy. take care. You can type with a bad back, but not much else.