I did once wonder about trying to do my stair-walking exercise in heels so I could both exercise and get more used to heels in one swell foop.Having just broken my arm in a cycling accident I am in no position to feel superior.
Nevertheless if I have learnt one thing in the last three years, it is: be extra careful in very high heels, especially on paving stones with gaps and on stairs. Go down them standing slightly to one side, facing the banister, AND HOLD THE BANISTER!
Fortunately I realised it was perhaps not one of my more cunning plans before I discovered the hard way.
Bummer about your arm. "Get well soon" doesn't sound quite enough...